diff --git a/lib/customize/pref.prf b/lib/customize/pref.prf
index d6e32b2..0c6c082 100644
--- a/lib/customize/pref.prf
+++ b/lib/customize/pref.prf
@@ -349,6 +349,9 @@ keymap-input:1:^C
 # Message colors
 %:message.prf

+# Message sounds
+%:sound.prf
+
 ##### System Specific Subfiles #####

 ?:[EQU $SYS gcu]
diff --git a/lib/customize/sound.prf b/lib/customize/sound.prf
new file mode 100644
index 0000000..3595a03
--- /dev/null
+++ b/lib/customize/sound.prf
@@ -0,0 +1,513 @@
+# sound.cfg
+#
+# Configuration file for the Angband sound events
+#
+# The format is:
+# <event name>:<sample-names seperated by spaces>
+#
+# Example:
+# hit:hit hit1
+#
+
+#
+# This is the Dubtrain Angband Sound config list, v.3.1.0 - February 24th, 2009
+#
+# Licensed under a Creative Commons non-commercial agreement
+#
+# Inspired by the original Craig's Angband Sound Patch.
+#
+# But with all new sounds.
+#
+# contact angband@dubtrain.com
+#
+# download zipped archive at www.dubtrain.com/angband
+#
+#
+
+
+#
+# Ambient sounds
+#
+
+# Town during the day.
+sound:AMBIENT_DAY:amb_thunder_rain
+
+# Town during the night.
+sound:AMBIENT_NITE:amb_guitar_chord amb_thunder_roll
+
+# Dungeon levels 1-20 (50'-1000')
+sound:AMBIENT_DNG1:amb_door_iron amb_bell_metal1
+
+# Dungeon levels 21-40 (1050'-2000')
+sound:AMBIENT_DNG2:amb_bell_tibet1 amb_bell_metal2 amb_gong_strike
+
+# Dungeon levels 41-60 (2050'-3000')
+sound:AMBIENT_DNG3:amb_bell_tibet2 amb_dungeon_echo amb_pulse_low
+
+# Dungeon levels 61-80 (3050'-4000')
+sound:AMBIENT_DNG4:amb_bell_tibet3 amb_dungeon_echowet amb_gong_undertone
+
+# Dungeon levels 81 and beyond (4050'-)
+sound:AMBIENT_DNG5:amb_door_doom amb_gong_chinese amb_gong_low
+
+#
+# Store sounds
+#
+
+# The shopkeep bought a worthless item.
+sound:STORE1:sto_man_hey
+
+# The shopkeep paid too much for an item.
+sound:STORE2:id_bad_dang
+
+# The shopkeep got away with a good bargain.
+sound:STORE3:sto_man_haha
+
+# The shopkeep got away with a great bargain.
+sound:STORE4:sto_man_whoohaha
+
+# You make a normal transaction (buying or selling).
+sound:STORE5:sto_coins_countertop sto_bell_register1 sto_bell_register2
+
+# You enter a store.
+sound:STORE_ENTER:sto_bell_desk sto_bell_ding sto_bell_dingaling sto_bell_jingles sto_bell_ringing sto_bell_shop
+
+# You enter your home.
+sound:STORE_HOME:plm_door_entrance
+
+# You leave a store.
+sound:STORE_LEAVE:plm_door_bolt
+
+#
+# Player sounds - combat
+#
+
+# You succeed in a melee attack against a monster.
+sound:HIT:plc_hit_hay plc_hit_body
+
+# It was a good hit!
+sound:HIT_GOOD:plc_hit_anvil
+
+# It was a great hit!
+sound:HIT_GREAT:plc_hit_groan
+
+# It was a superb hit!
+sound:HIT_SUPERB:plc_hit_grunt
+
+# It was a *GREAT* hit!
+sound:HIT_HI_GREAT:plc_hit_grunt2
+
+# It was a *SUPERB* hit!
+sound:HIT_HI_SUPERB:plc_hit_anvil2
+
+# You miss a melee attack against a monster.
+sound:MISS:plc_miss_arrow2
+
+# You fire a missile.
+sound:SHOOT:plc_miss_arrow
+
+# You hit something with a missile.
+sound:SHOOT_HIT:plc_hit_arrow
+
+# You receive a hitpoint warning.
+sound:HITPOINT_WARN:plc_bell_warn
+
+# You die.
+sound:DEATH:plc_die_laugh
+
+#
+# Player sounds - status changes
+#
+
+# You become blind.
+sound:BLIND:pls_tone_conk
+
+# You become confused.
+sound:CONFUSED:pls_man_ugh
+
+# You become poisoned.
+sound:POISONED:pls_tone_guiro
+
+# You become afraid.
+sound:AFRAID:pls_man_yell
+
+# You become paralyzed.
+sound:PARALYZED:pls_man_gulp_new
+
+# You feel drugged (chaos effects).
+sound:DRUGGED:pls_breathe_in
+
+# You become slower.
+sound:SLOW:pls_man_sigh
+
+# You become stunned.
+sound:STUN:pls_bell_mute
+
+# You suffer a cut.
+sound:CUT:pls_man_argoh
+
+# A stat is drained
+sound:DRAIN_STAT:pls_tone_headstock
+
+# You recover from a condition (blind, confused, etc.)
+sound:RECOVER:pls_bell_chime_new
+
+# You become faster.
+sound:SPEED:pls_bell_sustain
+
+# You attain a mystic shield.
+sound:SHIELD:pls_bell_bowl
+
+# You become blessed.
+sound:BLESSED:sum_angel_song
+
+# You feel heroic.
+sound:HERO:pls_tone_goblet
+
+# You are bold.
+sound:BOLD:pls_bell_hibell_soft
+
+# You become berserk.
+sound:BERSERK:pls_man_scream2
+
+# You feel protected from evil.
+sound:PROT_EVIL:pls_bell_glass
+
+# You feel invulnerable. (does any item/spell do this anymore?)
+sound:INVULN:pls_tone_blurk
+
+# You can see invisible things.
+sound:SEE_INVIS:pls_tone_clave6
+
+# You can see the infrared spectrum
+sound:INFRARED:pls_tone_clavelo8
+
+# You become resistant to acid.
+sound:RES_ACID:pls_man_sniff
+
+# You become resistant to electricity.
+sound:RES_ELEC:pls_tone_elec
+
+# You become resistant to fire.
+sound:RES_FIRE:pls_tone_scrape
+
+# You become resistant to cold.
+sound:RES_COLD:pls_tone_stick
+
+# You become resistant to poison.
+sound:RES_POIS:pls_man_spit
+
+# You become hungry.
+sound:HUNGRY:pls_man_sob
+
+#
+# Player sounds - misc.
+#
+
+# You pick up money worth less than 200 au.
+sound:MONEY1:plm_coins_light plm_coins_shake
+
+# You pick up money worth between 200 and 600 au.
+sound:MONEY2:plm_chain_light plm_coins_pour
+
+# You pick up money worth 600 au or more.
+sound:MONEY3:plm_coins_dump
+
+# You (or a monster) drop something on the ground.
+sound:DROP:plm_drop_boot
+
+# You gain (or regain) a level.
+sound:LEVEL:plm_levelup
+
+# You successfully study a spell or prayer.
+sound:STUDY:plm_book_pageturn
+
+# You teleport or phase door.
+sound:TELEPORT:plm_chimes_jangle
+
+# You quaff a potion.
+sound:QUAFF:plm_bottle_clinks plm_cork_pop plm_cork_squeak
+
+# You zap a rod.
+sound:ZAP_ROD:plm_zap_rod
+
+# You take a step.  (unimplemented)
+# walk:
+
+# You teleport someone else away.
+sound:TPOTHER:plm_chimes_jangle
+
+# You bump into a wall or door.
+sound:HITWALL:plm_wood_thud
+
+# You eat something.
+sound:EAT:plm_eat_bite
+
+# You successfully dig through something.
+sound:DIG:plm_metal_clank
+
+# You open a door.
+sound:OPENDOOR:plm_door_bolt plm_door_creak plm_door_dungeon plm_door_entrance plm_door_open plm_door_opening plm_door_rusty plm_door_squeaky
+
+# You shut a door.
+sound:SHUTDOOR:plm_bang_dumpster plm_cabinet_shut plm_close_hatch plm_door_creakshut plm_door_latch plm_door_shut plm_door_slam
+
+# You teleport from a level (including via recall).
+sound:TPLEVEL:sum_bell_crystal
+
+# Default "bell" sound for system messages.
+sound:BELL:plm_jar_ding
+
+# You try to open something that's not a door.
+sound:NOTHING_TO_OPEN:plm_click_switch2 plm_door_knob
+
+# You fail to pick a lock.
+sound:LOCKPICK_FAIL:plm_click_dry plm_click_switch plm_click_wood plm_door_echolock plm_door_wooden
+
+# You pick a lock.
+sound:LOCKPICK:plm_break_wood plm_cabinet_open plm_chest_unlatch plm_lock_case plm_lock_distant plm_open_case
+
+# You disarm a trap.
+sound:DISARM:plm_bang_ceramic plm_chest_latch plm_click_switch3
+
+# You go up stairs.
+sound:STAIRS_UP:plm_floor_creak2
+
+# You go down stairs.
+sound:STAIRS_DOWN:plm_floor_creak
+
+# You activate an artifact.
+sound:ACT_ARTIFACT:plm_aim_wand
+
+# You use a staff.
+sound:USE_STAFF:plm_use_staff
+
+# An object is destroyed.
+sound:DESTROY:plm_bang_metal plm_break_canister plm_break_glass plm_break_glass2 plm_break_plates plm_break_shatter plm_break_smash plm_glass_breaking plm_glass_break plm_glass_smashing
+
+# You wield or take off something.
+sound:WIELD:plm_metal_sharpen
+
+# You take something in or out of your quiver.
+sound:QUIVER:plc_miss_swish
+
+# You wield a cursed item.
+sound:CURSED:pls_man_oooh
+
+# You notice something (generic notice)
+sound:NOTICE:id_bad_hmm
+
+# You notice something about your equipment or inventory.
+sound:PSEUDOID:id_good_hmm
+
+# You successfully cast a spell.
+sound:SPELL:plm_spell1 plm_spell2 plm_spell3
+
+# You successfully pray a prayer.
+sound:PRAYER:sum_angel_song
+
+#
+# Monster Sounds - combat
+#
+
+# A monster flees in terror.
+sound:FLEE:mco_creature_yelp
+
+# A monster is killed.
+sound:KILL:mco_howl_croak mco_howl_deep mco_howl_distressed mco_howl_high mco_howl_long
+
+# A unique is killed.
+sound:KILL_UNIQUE:sum_ghost_wail
+
+# Morgoth, Lord of Darkness is killed.
+sound:KILL_KING:amb_guitar_chord
+
+# Attack - hit
+sound:MON_HIT:mco_hit_whip
+
+# Attack - touch
+sound:MON_TOUCH:mco_click_vibra
+
+# Attack - punch
+sound:MON_PUNCH:mco_squish_snap
+
+# Attack - kick
+sound:MON_KICK:mco_rubber_thud
+
+# Attack - claw
+sound:MON_CLAW:mco_ceramic_trill mco_scurry_dry
+
+# Attack - bite
+sound:MON_BITE:mco_snarl_short mco_bite_soft mco_bite_munch mco_bite_long mco_bite_short mco_bite_gnash mco_bite_chomp mco_bite_regular mco_bite_small mco_bite_dainty mco_bite_hard mco_bite_chew
+
+# Attack - sting
+sound:MON_STING:mco_castanet_trill mco_tube_hit
+
+# Attack - butt
+sound:MON_BUTT:mco_cuica_rubbing mco_thud_crash
+
+# Attack - crush
+sound:MON_CRUSH:mco_dino_low mco_squish_hit
+
+# Attack - engulf
+sound:MON_ENGULF:mco_dino_talk mco_dino_yawn
+
+# Attack - crawl
+sound:MON_CRAWL:mco_card_shuffle mco_shake_roll
+
+# Attack - drool
+sound:MON_DROOL:mco_creature_choking mco_liquid_squirt
+
+# Attack - spit
+sound:MON_SPIT:mco_attack_spray
+
+# Attack - gaze
+sound:MON_GAZE:mco_thoing_backwards
+
+# Attack - wail
+sound:MON_WAIL:mco_dino_low
+
+# Attack - release spores
+sound:MON_SPORE:mco_dub_wobble mco_spray_long
+
+# Attack - beg for money
+sound:MON_BEG:mco_man_mumble
+
+# Attack - insult
+sound:MON_INSULT:mco_strange_thwoink
+
+# Attack - moan
+sound:MON_MOAN:mco_strange_music
+
+# Attack - shriek
+sound:SHRIEK:mco_mouse_squeaks
+
+# Spell - create traps
+sound:CREATE_TRAP:mco_thoing_deep
+
+# Spell - cause fear
+sound:CAST_FEAR:mco_creature_groan mco_dino_slur
+
+# Multiply (breed explosively)
+sound:MULTIPLY:mco_frog_trill
+
+#
+# Summons
+#
+
+# Summon one or more monsters.
+sound:SUM_MONSTER:sum_chime_jangle
+
+# Summon angels.
+sound:SUM_AINU:sum_angel_song
+
+# Summon undead.
+sound:SUM_UNDEAD:sum_ghost_oooo
+
+# Summon animals.
+sound:SUM_ANIMAL:sum_lion_growl
+
+# Summon spiders.
+sound:SUM_SPIDER:sum_piano_scrape
+
+# Summon hounds.
+sound:SUM_HOUND:sum_lion_growl
+
+# Summon hydras.
+sound:SUM_HYDRA:sum_piano_scrape
+
+# Summon demons.
+sound:SUM_DEMON:sum_ghost_wail sum_laugh_evil2
+
+# Summon dragon.
+sound:SUM_DRAGON:sum_piano_scrape
+
+# Summon greater undead.
+sound:SUM_HI_UNDEAD:sum_ghost_moan
+
+# Summon greater dragons.
+sound:SUM_HI_DRAGON:sum_gong_temple
+
+# Summon greater demons.
+sound:SUM_HI_DEMON:sum_ghost_moan
+
+# Summon Ringwraiths.
+sound:SUM_WRAITH:sum_bell_hand
+
+# Summon uniques.
+sound:SUM_UNIQUE:sum_bell_tone
+
+#
+# Breath weapons
+#
+
+# Breathe frost.
+sound:BR_FROST:mco_attack_breath
+
+# Breathe electricity.
+MST_BR_ELEC:mco_attack_breath
+
+# Breathe acid.
+sound:BR_ACID:mco_attack_breath
+
+# Breathe gas.
+sound:BR_GAS:mco_attack_breath
+
+# Breathe fire.
+sound:BR_FIRE:mco_attack_breath
+
+# Breathe disenchantment.
+sound:BR_DISEN:mco_attack_breath
+
+# Breathe chaos.
+sound:BR_CHAOS:mco_attack_breath
+
+# Breathe shards.
+sound:BR_SHARDS:mco_attack_breath
+
+# Breathe sound.
+sound:BR_SOUND:mco_attack_breath
+
+# Breathe light.
+sound:BR_LIGHT:mco_attack_breath
+
+# Breathe darkness.
+sound:BR_DARK:mco_attack_breath
+
+# Breathe nether.
+sound:BR_NETHER:mco_attack_breath
+
+# Breathe nexus.
+sound:BR_NEXUS:mco_attack_breath
+
+# Breathe time.
+sound:BR_TIME:mco_attack_breath
+
+# Breathe inertia.
+sound:BR_INERTIA:mco_attack_breath
+
+# Breathe gravity.
+sound:BR_GRAVITY:mco_attack_breath
+
+# Breathe plasma.
+sound:BR_PLASMA:mco_attack_breath
+
+# Breathe force.
+sound:BR_FORCE:mco_attack_breath
+
+# Breathe the elements (power dragon scale mail).
+sound:BR_ELEMENTS:mco_attack_breath
+
+#
+# Identifying Items
+#
+
+# Identify a bad item (including bad ego items and artifacts).
+sound:IDENT_BAD:id_bad_aww id_bad_dang id_bad_hmm id_bad_hmph id_bad_ohh
+
+# Identify a good ego item.
+sound:IDENT_EGO:id_ego_whoa id_ego_woohoo id_ego_yeah id_ego_yeah2 id_ego_yes
+
+# Identify a good artifact.
+sound:IDENT_ART:id_good_hey id_good_hey2 id_good_hmm id_good_huh id_good_ooh id_good_ooo id_good_wow
+
diff --git a/src/Makefile.src b/src/Makefile.src
index 5d4a738..c4296f9 100644
--- a/src/Makefile.src
+++ b/src/Makefile.src
@@ -158,6 +158,7 @@ ANGFILES = \
 	score.o \
 	save.o \
 	savefile.o \
+	sound-core.o \
 	store.o \
 	target.o \
 	trap.o \
diff --git a/src/avltree.h b/src/avltree.h
new file mode 100644
index 0000000..f3c5977
--- /dev/null
+++ b/src/avltree.h
@@ -0,0 +1,212 @@
+/* tree.h -- AVL trees (in the spirit of BSD's 'queue.h')	-*- C -*-	*/
+
+/* Copyright (c) 2005 Ian Piumarta
+ *
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the 'Software'), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * provided that the above copyright notice(s) and this permission notice appear
+ * in all copies of the Software and that both the above copyright notice(s) and
+ * this permission notice appear in supporting documentation.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS'.  USE ENTIRELY AT YOUR OWN RISK.
+ */
+
+/* This file defines an AVL balanced binary tree [Georgii M. Adelson-Velskii and
+ * Evgenii M. Landis, 'An algorithm for the organization of information',
+ * Doklady Akademii Nauk SSSR, 146:263-266, 1962 (Russian).  Also in Myron
+ * J. Ricci (trans.), Soviet Math, 3:1259-1263, 1962 (English)].
+ *
+ * An AVL tree is headed by pointers to the root node and to a function defining
+ * the ordering relation between nodes.  Each node contains an arbitrary payload
+ * plus three fields per tree entry: the depth of the subtree for which it forms
+ * the root and two pointers to child nodes (singly-linked for minimum space, at
+ * the expense of direct access to the parent node given a pointer to one of the
+ * children).  The tree is rebalanced after every insertion or removal.  The
+ * tree may be traversed in two directions: forward (in-order left-to-right) and
+ * reverse (in-order, right-to-left).
+ *
+ * Because of the recursive nature of many of the operations on trees it is
+ * necessary to define a number of helper functions for each type of tree node.
+ * The macro TREE_DEFINE(node_tag, entry_name) defines these functions with
+ * unique names according to the node_tag.  This macro should be invoked,
+ * thereby defining the necessary functions, once per node tag in the program.
+ *
+ * For details on the use of these macros, see the tree(3) manual page.
+ */
+
+#ifndef __tree_h
+#define __tree_h
+
+
+#define TREE_DELTA_MAX	1
+
+#define TREE_ENTRY(type)			\
+  struct {					\
+    struct type	*avl_left;			\
+    struct type	*avl_right;			\
+    int		 avl_height;			\
+  }
+
+#define TREE_HEAD(name, type)				\
+  struct name {						\
+    struct type *th_root;				\
+    int  (*th_cmp)(struct type *lhs, struct type *rhs);	\
+  }
+
+#define TREE_INITIALIZER(cmp) { 0, cmp }
+
+#define TREE_DELTA(self, field)								\
+  (( (((self)->field.avl_left)  ? (self)->field.avl_left->field.avl_height  : 0))	\
+   - (((self)->field.avl_right) ? (self)->field.avl_right->field.avl_height : 0))
+
+/* Recursion prevents the following from being defined as macros. */
+
+#define TREE_DEFINE(node, field)									\
+													\
+  struct node *TREE_BALANCE_##node##_##field(struct node *);						\
+													\
+  struct node *TREE_ROTL_##node##_##field(struct node *self)						\
+  {													\
+    struct node *r= self->field.avl_right;								\
+    self->field.avl_right= r->field.avl_left;								\
+    r->field.avl_left= TREE_BALANCE_##node##_##field(self);						\
+    return TREE_BALANCE_##node##_##field(r);								\
+  }													\
+													\
+  struct node *TREE_ROTR_##node##_##field(struct node *self)						\
+  {													\
+    struct node *l= self->field.avl_left;								\
+    self->field.avl_left= l->field.avl_right;								\
+    l->field.avl_right= TREE_BALANCE_##node##_##field(self);						\
+    return TREE_BALANCE_##node##_##field(l);								\
+  }													\
+													\
+  struct node *TREE_BALANCE_##node##_##field(struct node *self)						\
+  {													\
+    int delta= TREE_DELTA(self, field);									\
+													\
+    if (delta < -TREE_DELTA_MAX)									\
+      {													\
+	if (TREE_DELTA(self->field.avl_right, field) > 0)						\
+	  self->field.avl_right= TREE_ROTR_##node##_##field(self->field.avl_right);			\
+	return TREE_ROTL_##node##_##field(self);							\
+      }													\
+    else if (delta > TREE_DELTA_MAX)									\
+      {													\
+	if (TREE_DELTA(self->field.avl_left, field) < 0)						\
+	  self->field.avl_left= TREE_ROTL_##node##_##field(self->field.avl_left);			\
+	return TREE_ROTR_##node##_##field(self);							\
+      }													\
+    self->field.avl_height= 0;										\
+    if (self->field.avl_left && (self->field.avl_left->field.avl_height > self->field.avl_height))	\
+      self->field.avl_height= self->field.avl_left->field.avl_height;					\
+    if (self->field.avl_right && (self->field.avl_right->field.avl_height > self->field.avl_height))	\
+      self->field.avl_height= self->field.avl_right->field.avl_height;					\
+    self->field.avl_height += 1;									\
+    return self;											\
+  }													\
+													\
+  struct node *TREE_INSERT_##node##_##field								\
+    (struct node *self, struct node *elm, int (*compare)(struct node *lhs, struct node *rhs))		\
+  {													\
+    if (!self)												\
+      return elm;											\
+    if (compare(elm, self) < 0)										\
+      self->field.avl_left= TREE_INSERT_##node##_##field(self->field.avl_left, elm, compare);		\
+    else												\
+      self->field.avl_right= TREE_INSERT_##node##_##field(self->field.avl_right, elm, compare);		\
+    return TREE_BALANCE_##node##_##field(self);								\
+  }													\
+													\
+  struct node *TREE_FIND_##node##_##field								\
+    (struct node *self, struct node *elm, int (*compare)(struct node *lhs, struct node *rhs))		\
+  {													\
+    if (!self)												\
+      return 0;												\
+    if (compare(elm, self) == 0)									\
+      return self;											\
+    if (compare(elm, self) < 0)										\
+      return TREE_FIND_##node##_##field(self->field.avl_left, elm, compare);				\
+    else												\
+      return TREE_FIND_##node##_##field(self->field.avl_right, elm, compare);				\
+  }													\
+													\
+  struct node *TREE_MOVE_RIGHT_##node##_##field(struct node *self, struct node *rhs)					\
+  {													\
+    if (!self)												\
+      return rhs;											\
+    self->field.avl_right= TREE_MOVE_RIGHT_##node##_##field(self->field.avl_right, rhs);					\
+    return TREE_BALANCE_##node##_##field(self);								\
+  }													\
+													\
+  struct node *TREE_REMOVE_##node##_##field								\
+    (struct node *self, struct node *elm, int (*compare)(struct node *lhs, struct node *rhs))		\
+  {													\
+    if (!self) return 0;										\
+													\
+    if (compare(elm, self) == 0)									\
+      {													\
+	struct node *tmp= TREE_MOVE_RIGHT_##node##_##field(self->field.avl_left, self->field.avl_right);			\
+	self->field.avl_left= 0;									\
+	self->field.avl_right= 0;									\
+	return tmp;											\
+      }													\
+    if (compare(elm, self) < 0)										\
+      self->field.avl_left= TREE_REMOVE_##node##_##field(self->field.avl_left, elm, compare);		\
+    else												\
+      self->field.avl_right= TREE_REMOVE_##node##_##field(self->field.avl_right, elm, compare);		\
+    return TREE_BALANCE_##node##_##field(self);								\
+  }													\
+													\
+  void TREE_FORWARD_APPLY_ALL_##node##_##field								\
+    (struct node *self, void (*function)(struct node *node, void *data), void *data)			\
+  {													\
+    if (self)												\
+      {													\
+	TREE_FORWARD_APPLY_ALL_##node##_##field(self->field.avl_left, function, data);			\
+	function(self, data);										\
+	TREE_FORWARD_APPLY_ALL_##node##_##field(self->field.avl_right, function, data);			\
+      }													\
+  }													\
+													\
+  void TREE_REVERSE_APPLY_ALL_##node##_##field								\
+    (struct node *self, void (*function)(struct node *node, void *data), void *data)			\
+  {													\
+    if (self)												\
+      {													\
+	TREE_REVERSE_APPLY_ALL_##node##_##field(self->field.avl_right, function, data);			\
+	function(self, data);										\
+	TREE_REVERSE_APPLY_ALL_##node##_##field(self->field.avl_left, function, data);			\
+      }													\
+  }
+
+#define TREE_INSERT(head, node, field, elm)						\
+  ((head)->th_root= TREE_INSERT_##node##_##field((head)->th_root, (elm), (head)->th_cmp))
+
+#define TREE_FIND(head, node, field, elm)				\
+  (TREE_FIND_##node##_##field((head)->th_root, (elm), (head)->th_cmp))
+
+#define TREE_REMOVE(head, node, field, elm)						\
+  ((head)->th_root= TREE_REMOVE_##node##_##field((head)->th_root, (elm), (head)->th_cmp))
+
+#define TREE_DEPTH(head, field)			\
+  ((head)->th_root->field.avl_height)
+
+#define TREE_FORWARD_APPLY(head, node, field, function, data)	\
+  TREE_FORWARD_APPLY_ALL_##node##_##field((head)->th_root, function, data)
+
+#define TREE_REVERSE_APPLY(head, node, field, function, data)	\
+  TREE_REVERSE_APPLY_ALL_##node##_##field((head)->th_root, function, data)
+
+#define TREE_INIT(head, cmp) do {		\
+    (head)->th_root= 0;				\
+    (head)->th_cmp= (cmp);			\
+  } while (0)
+
+
+#endif /* __tree_h */
diff --git a/src/main.c b/src/main.c
index 6717e0e..948a852 100644
--- a/src/main.c
+++ b/src/main.c
@@ -43,6 +43,8 @@

 #include "main.h"

+#include "sound.h"
+
 /**
  * List of the available modules in the order they are tried.
  */
@@ -69,22 +71,6 @@ static const struct module modules[] =
 #endif /* USE_STATS */
 };

-static int init_sound_dummy(int argc, char *argv[]) {
-	return 0;
-}
-
-/**
- * List of sound modules in the order they should be tried.
- */
-static const struct module sound_modules[] =
-{
-#ifdef SOUND_SDL
-	{ "sdl", "SDL_mixer sound module", init_sound_sdl },
-#endif /* SOUND_SDL */
-
-	{ "none", "No sound", init_sound_dummy },
-};
-
 /**
  * A hook for "quit()".
  *
@@ -467,9 +453,7 @@ int main(int argc, char *argv[])
 				}
 				puts("                 Multiple -d options are allowed.");
 				puts("  -s<mod>        Use sound module <sys>:");
-				for (i = 0; i < (int)N_ELEMENTS(sound_modules); i++)
-					printf("     %s   %s\n", sound_modules[i].name,
-					       sound_modules[i].help);
+				print_sound_help();
 				puts("  -m<sys>        Use module <sys>, where <sys> can be:");

 				/* Print the name and help for each available module */
@@ -532,12 +516,6 @@ int main(int argc, char *argv[])

 #endif /* UNIX */

-	/* Try the modules in the order specified by sound_modules[] */
-	for (i = 0; i < (int)N_ELEMENTS(sound_modules); i++)
-		if (!soundstr || streq(soundstr, sound_modules[i].name))
-			if (0 == sound_modules[i].init(argc, argv))
-				break;
-
 	/* Catch nasty signals */
 	signals_init();

@@ -549,6 +527,10 @@ int main(int argc, char *argv[])
 	init_angband();
 	textui_init();

+	/* Initialise sound */
+	if (0 != init_sound(soundstr, argc, argv))
+		plog("Failed to initialize sound!");	/* Non-fatal */
+
 	/* Wait for response */
 	pause_line(Term);

diff --git a/src/main.h b/src/main.h
index 70c11e0..39d442b 100644
--- a/src/main.h
+++ b/src/main.h
@@ -23,9 +23,6 @@
 #include "angband.h"
 #include "ui-term.h"

-extern errr init_sound_sdl(int argc, char **argv);
-
-
 extern errr init_lfb(int argc, char **argv);
 extern errr init_x11(int argc, char **argv);
 extern errr init_xpj(int argc, char **argv);
diff --git a/src/message.h b/src/message.h
index d08a8e6..1474fa3 100644
--- a/src/message.h
+++ b/src/message.h
@@ -34,7 +34,7 @@ enum {
 /* Functions */
 void messages_init(void);
 void messages_free(void);
-u16b messages_num(void);
+u16b messages_num(void);
 void message_add(const char *str, u16b type);
 const char *message_str(u16b age);
 u16b message_count(u16b age);
diff --git a/src/snd-sdl.c b/src/snd-sdl.c
index afce53f..de9c04d 100644
--- a/src/snd-sdl.c
+++ b/src/snd-sdl.c
@@ -4,6 +4,7 @@
  *
  * Copyright (c) 2004 Brendon Oliver <brendon.oliver@gmail.com>
  * Copyright (c) 2007 Andi Sidwell <andi@takkaria.org>
+ * Copyright (c) 2016 Graeme Russ <graeme.russ@gmail.com>
  * A large chunk of this file was taken and modified from main-ros.
  *
  * This work is free software; you can redistribute it and/or modify it
@@ -19,86 +20,52 @@
  */
 #include "angband.h"
 #include "init.h"
-
+#include "sound.h"
+
 #ifdef SOUND_SDL


 #include "SDL.h"
 #include "SDL_mixer.h"

-
-/**
- * Don't cache audio
- */
-static bool no_cache_audio = false;
-
-/**
- * Using mp3s
- */
-static bool use_mp3 = false;
-
-/**
- * Arbitary limit on number of samples per event
- */
-#define MAX_SAMPLES      16
+typedef enum sdl_sample_type {
+	SDL_CHUNK,
+	SDL_MUSIC,
+	SDL_NULL
+} sdl_sample_type;

 /**
  * Struct representing all data about an event sample
  */
 typedef struct
 {
-	int num;                        /* Number of samples for this event */
-	Mix_Chunk *wavs[MAX_SAMPLES];   /* Sample array */
-	Mix_Music *mp3s[MAX_SAMPLES];   /* Sample array */
-	char *paths[MAX_SAMPLES]; /* Relative pathnames for samples */
-} sample_list;
-
-
-/**
- * Just need an array of SampInfos
- */
-static sample_list samples[MSG_MAX];
-
-
-/**
- * Shut down the sound system and free resources.
- */
-static void close_audio(void)
-{
-	size_t i;
-	int j;
-
-	/* Free all the sample data*/
-	for (i = 0; i < MSG_MAX; i++) {
-  		sample_list *smp = &samples[i];
-
-		/* Nuke all samples */
-		for (j = 0; j < smp->num; j++) {
-			if (use_mp3)
-				Mix_FreeMusic(smp->mp3s[j]);
-			else
-				Mix_FreeChunk(smp->wavs[j]);
-			string_free(smp->paths[j]);
-		}
-	}
-
-	/* Close the audio */
-	Mix_CloseAudio();
-
-	/* XXX This may conflict with the SDL port */
-	SDL_Quit();
-}
-
-
+	union {
+		Mix_Chunk *chunk;	/* Sample in WAVE format */
+		Mix_Music *music;	/* Sample in MP3 format */
+	} sample_data;
+
+	sdl_sample_type sample_type;
+	char *path;			/* Relative pathnames for samples */
+} sdl_sample;
+
+typedef struct sdl_file_type {
+	const char *extension;
+	sdl_sample_type type;
+} sdl_file_type_t;
+
+/* List of supported file types */
+static const sdl_file_type_t supported_file_types[] = { {".mp3", SDL_MUSIC},
+							{".ogg", SDL_CHUNK},
+							{"", SDL_NULL} };
 /**
- * Initialise SDL and open the mixer
+ * Initialise SDL and open the mixer.
  */
-static bool open_audio(void)
+static bool open_audio_sdl(int argc, char **argv)
 {
 	int audio_rate;
 	Uint16 audio_format;
 	int audio_channels;
-
+
 	/* Initialize variables */
 	audio_rate = 22050;
 	audio_format = AUDIO_S16;
@@ -106,13 +73,13 @@ static bool open_audio(void)

 	/* Initialize the SDL library */
 	if (SDL_Init(SDL_INIT_AUDIO) < 0) {
-		plog_fmt("Couldn't initialize SDL: %s", SDL_GetError());
+		plog_fmt("SDL: Couldn't initialize SDL: %s", SDL_GetError());
 		return false;
 	}

 	/* Try to open the audio */
 	if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, 4096) < 0) {
-		plog_fmt("Couldn't open mixer: %s", SDL_GetError());
+		plog_fmt("SDL: Couldn't open mixer: %s", SDL_GetError());
 		return false;
 	}

@@ -120,228 +87,192 @@ static bool open_audio(void)
 	return true;
 }

-
-
 /**
- * Read sound.cfg and map events to sounds; then load all the sounds into
- * memory to avoid I/O latency later.
+ * Load a sound from file.
  */
-static bool sound_sdl_init(bool no_cache)
+static bool load_sample_sdl(sdl_sample *sample)
 {
-	char path[2048];
-	char buffer[2048];
-	ang_file *fff;
+	switch (sample->sample_type) {
+		case SDL_CHUNK:
+			sample->sample_data.chunk = Mix_LoadWAV(sample->path);

+			if (sample->sample_data.chunk)
+				return true;

-	/* Initialise the mixer  */
-	if (!open_audio())
-	    return false;
+			break;

+		case SDL_MUSIC:
+			sample->sample_data.music = Mix_LoadMUS(sample->path);

-	/* Find and open the config file */
-	path_build(path, sizeof(path), ANGBAND_DIR_SOUNDS, "sound.cfg");
-	fff = file_open(path, MODE_READ, -1);
+			if (sample->sample_data.music)
+				return true;

-	/* Handle errors */
-	if (!fff) {
-		plog_fmt("Failed to open sound config (%s):\n    %s",
-		          path, strerror(errno));
-		return false;
+			break;
+
+		default:
+			plog_fmt("SDL: Oops - Unsupported file type");
+			break;
 	}

-	/* Parse the file */
-	/* Lines are always of the form "name = sample [sample ...]" */
-	while (file_getl(fff, buffer, sizeof(buffer))) {
-		char *msg_name;
-		char *sample_list;
-		char *search;
-		char *cur_token;
-		char *next_token;
-		int event;
-
-		/* Skip anything not beginning with an alphabetic character */
-		if (!buffer[0] || !isalpha((unsigned char)buffer[0])) continue;
-
-		/* Split the line into two: message name, and the rest */
-		search = strchr(buffer, ' ');
-		sample_list = strchr(search + 1, ' ');
-		if (!search) continue;
-		if (!sample_list) continue;
-
-		/* Set the message name, and terminate at first space */
-		msg_name = buffer;
-		search[0] = '\0';
-
-
-		/* Make sure this is a valid event name */
-		event = message_lookup_by_sound_name(msg_name);
-		if (event < 0) continue;
-
-		/* Advance the sample list pointer so it's at the beginning of text */
-		sample_list++;
-		if (!sample_list[0]) continue;
-
-		/* Terminate the current token */
-		cur_token = sample_list;
-		search = strchr(cur_token, ' ');
-		if (search) {
-			search[0] = '\0';
-			next_token = search + 1;
-		} else {
-			next_token = NULL;
-		}
+	return false;
+}

-        /*
-         * Now we find all the sample names and add them one by one
-         */
-        while (cur_token) {
-			int num = samples[event].num;
-			bool got_file_type = false;
-
-			/* Don't allow too many samples */
-			if (num >= MAX_SAMPLES) break;
-
-			/* Build the path to the sample */
-			path_build(path, sizeof(path), ANGBAND_DIR_SOUNDS, cur_token);
-			if (!file_exists(path)) goto next_token;
-
-			if (!got_file_type) {
-			        if (streq(path + strlen(path) - 3, "mp3")) {
-				        use_mp3 = true;
-					got_file_type = true;
-				}
-			}
+/**
+ * Load a sound and return a pointer to the associated SDL Sound data
+ * structure back to the core sound module.
+ */
+static bool load_sound_sdl(const char *sound_name, void **data)
+{
+	char path[2048];
+	char *filename_buf;
+	size_t filename_buf_size;
+	sdl_sample *sample = NULL;
+	int i = 0;
+	bool loaded = false;
+
+	/* Build the path to the sample */
+	path_build(path, sizeof(path), ANGBAND_DIR_SOUNDS, sound_name);
+
+	/*
+	 * Create a buffer to store the filename plus three character
+	 * extension (5 = '.' + 3 character extension + '\0'
+	 */
+	filename_buf_size = strlen(path) + 5;
+	filename_buf = mem_zalloc(filename_buf_size);
+
+	while ((SDL_NULL != supported_file_types[i].type) && (!loaded)) {
+		my_strcpy(filename_buf, path, filename_buf_size);
+		filename_buf = string_append(filename_buf,
+					     supported_file_types[i].extension);
+
+		if (file_exists(filename_buf)) {
+			if (!sample)
+				sample = mem_zalloc(sizeof(*sample));
+
+			if (sample) {
+				sample->sample_type = supported_file_types[i].type;
+				sample->path = string_make(filename_buf);
+
+				/* Try and load the sample file */
+				if (!load_sample_sdl(sample))
+					mem_free(sample->path);
+				else
+					loaded = true;

-			/* Don't load now if we're not caching */
-			if (no_cache) {
-				/* Just save the path for later */
-				samples[event].paths[num] = string_make(path);
 			} else {
-				/* Load the file now */
-				if (use_mp3) {
-					samples[event].mp3s[num] = Mix_LoadMUS(path);
-					if (!samples[event].mp3s[num]) {
-						plog_fmt("%s: %s", SDL_GetError(), strerror(errno));
-						goto next_token;
-					}
-				} else {
-					samples[event].wavs[num] = Mix_LoadWAV(path);
-					if (!samples[event].wavs[num]) {
-					        plog_fmt("%s: %s", SDL_GetError(), strerror(errno));
-						goto next_token;
-					}
-				}
-			}
-
-			/* Imcrement the sample count */
-			samples[event].num++;
-
-		next_token:
-
-			/* Figure out next token */
-			cur_token = next_token;
-			if (next_token) {
-				/* Try to find a space */
-				search = strchr(cur_token, ' ');
-
-				/* If we can find one, terminate, and set new "next" */
-				if (search) {
-					search[0] = '\0';
-					next_token = search + 1;
-				} else {
-					/* Otherwise prevent infinite looping */
-					next_token = NULL;
-				}
+				/* Out of memory */
+				mem_free(filename_buf);
+				data = NULL;
+				return false;
 			}
 		}
+
+		i++;
 	}

-	/* Close the file */
-	file_close(fff);
+	mem_free(filename_buf);

+	if (!loaded) {
+		plog_fmt("SDL: Failed to load sound '%s')", sound_name);
+		mem_free(sample);
+		sample = NULL;
+	}

-	/* Success */
-	return true;
+	*data = (void *)sample;
+
+	return (NULL != sample);
 }

 /**
- * Play a sound of type "event".
+ * Play the sound stored in the provided SDL Sound data structure.
  */
-static void play_sound(game_event_type type, game_event_data *data, void *user)
+static bool play_sound_sdl(void *data)
 {
-	Mix_Chunk *wave = NULL;
-	Mix_Music *mp3 = NULL;
-	int s;
-
-	int event = data->message.type;
-
-	/* Paranoia */
-	if (event < 0 || event >= MSG_MAX) return;
-
-	/* Check there are samples for this event */
-	if (!samples[event].num) return;
-
-	/* Choose a random event */
-	s = randint0(samples[event].num);
-	if (use_mp3)
-	        mp3 = samples[event].mp3s[s];
-	else
-	        wave = samples[event].wavs[s];
-
-	/* Try loading it, if it's not cached */
-	if (!(wave || mp3)) {
-		/* Verify it exists */
-		const char *filename = samples[event].paths[s];
-		if (!file_exists(filename)) return;
-
-		/* Load */
-		if (use_mp3)
-		        mp3 = Mix_LoadMUS(filename);
-		else
-		        wave = Mix_LoadWAV(filename);
-	}
-
-	/* Check to see if we have a sound again */
-	if (!(wave || mp3)) {
-		plog("SDL sound load failed.");
-		return;
+	sdl_sample *sample = (sdl_sample *)data;
+
+	if (sample) {
+		switch (sample->sample_type) {
+			case SDL_CHUNK:
+				if (sample->sample_data.chunk)
+					return (0 == Mix_PlayChannel(-1, sample->sample_data.chunk, 0));
+				break;
+
+			case SDL_MUSIC:
+				if (sample->sample_data.music)
+					return (0 == Mix_PlayMusic(sample->sample_data.music, 1));
+				break;
+
+			default:
+				break;
+		}
 	}

-	/* Actually play the thing */
-	if (use_mp3)
-	        Mix_PlayMusic(mp3, 1);
-	else
-	        Mix_PlayChannel(-1, wave, 0);
+	return false;
 }

-
 /**
- * Init the SDL sound "module".
+ * Free resources referenced in the provided SDL Sound data structure.
  */
-errr init_sound_sdl(int argc, char **argv)
+static bool unload_sound_sdl(void *data)
 {
-	int i;
-
-	/* Parse args */
-	for (i = 1; i < argc; i++) {
-		if (prefix(argv[i], "-c")) {
-			no_cache_audio = true;
-			plog("Audio cache disabled.");
-			continue;
+	sdl_sample *sample = (sdl_sample *)data;
+
+	if (sample) {
+		switch (sample->sample_type) {
+			case SDL_CHUNK:
+				if (sample->sample_data.chunk)
+					 Mix_FreeChunk(sample->sample_data.chunk);
+
+				break;
+
+			case SDL_MUSIC:
+				if (sample->sample_data.music)
+					Mix_FreeMusic(sample->sample_data.music);
+
+				break;
+
+			default:
+				break;
 		}
-	}

-	/* Load sound preferences if requested */
-	if (!sound_sdl_init(no_cache_audio)) {
-		plog("Failed to load sound config");
+		if (sample->path)
+			mem_free(sample->path);

-		/* Failure */
-		return (1);
+		mem_free(sample);
 	}

-	/* Enable sound */
-	event_add_handler(EVENT_SOUND, play_sound, NULL);
-	atexit(close_audio);
+	return true;
+}
+
+/**
+ * Shut down the SDL sound module and free resources.
+ */
+static bool close_audio_sdl(void)
+{
+	/*
+	 * Close the audio.
+	 *
+	 * NOTE: All samples will have been free'd by the sound subsystem
+	 * calling unload_sound_sdl() for every sample that was loaded.
+	 */
+	Mix_CloseAudio();
+
+	/* XXX This may conflict with the SDL port */
+	SDL_Quit();
+
+	return true;
+}
+
+/**
+ * Init the SDL sound module.
+ */
+errr init_sound_sdl(struct sound_hooks *hooks, int argc, char **argv)
+{
+	hooks->open_audio_hook = open_audio_sdl;
+	hooks->close_audio_hook = close_audio_sdl;
+	hooks->load_sound_hook = load_sound_sdl;
+	hooks->unload_sound_hook = unload_sound_sdl;
+	hooks->play_sound_hook = play_sound_sdl;

 	/* Success */
 	return (0);
diff --git a/src/snd-sdl.h b/src/snd-sdl.h
new file mode 100644
index 0000000..3700cea
--- /dev/null
+++ b/src/snd-sdl.h
@@ -0,0 +1,23 @@
+/**
+ * \file sound.h
+ * \brief Sound handling
+ *
+ * Copyright (c) 2016 Graeme Russ
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ */
+
+#ifndef INCLUDED_Z_SOUND_SDL_H
+#define INCLUDED_Z_SOUND_SDL_H
+
+errr init_sound_sdl(struct sound_hooks *hooks, int argc, char **argv);
+
+#endif /* !INCLUDED_Z_SOUND_H */
diff --git a/src/sound-core.c b/src/sound-core.c
new file mode 100644
index 0000000..fc6210c
--- /dev/null
+++ b/src/sound-core.c
@@ -0,0 +1,410 @@
+/**
+ * \file sound-core.c
+ * \brief core sound support
+ *
+ * Copyright (c) 2016 Graeme Russ <graeme.russ@gmail.com>
+ *
+ * This work is free software; you can redistribute it and/or modify it
+ * under the terms of either:
+ *
+ * a) the GNU General Public License as published by the Free Software
+ *    Foundation, version 2, or
+ *
+ * b) the "Angband licence":
+ *    This software may be copied and distributed for educational, research,
+ *    and not for profit purposes provided that this copyright and statement
+ *    are included in all such copies.  Other copyrights may also apply.
+ */
+#include "angband.h"
+#include "init.h"
+#include "sound.h"
+#include "avltree.h"
+#include "main.h"
+
+#ifdef SOUND_SDL
+#include "snd-sdl.h"
+#endif
+
+struct sound_module
+{
+	const char *name;
+	const char *help;
+	errr (*init)(struct sound_hooks *hooks, int argc, char **argv);
+};
+
+/**
+ * List of sound modules in the order they should be tried.
+ */
+static const struct sound_module sound_modules[] =
+{
+#ifdef SOUND_SDL
+	{ "sdl", "SDL_mixer sound module", init_sound_sdl },
+#endif /* SOUND_SDL */
+
+	{ "", "", NULL },
+};
+
+/*
+ * Two trees are needed:
+ * - A mapping of 'sound names' to 'sound ids' - this is used during the
+ *   initial parsing of the sound configuration file to ensure we don't
+ *   load the same sounds multiple times (if a sound is mapped to more than
+ *   one message). When the sound sub-system is initialised, this tree is
+ *   'walked', with the sound name stored in each node passed to the platform
+ *   sound module which loads the sound
+ * - A mapping of 'message ids' to 'sound ids' - In the past, a static array
+ *   of size [MAX_MESSAGES][MAX_SOUND_PER_MESSAGE] was used, which results
+ *   in a horrendous waste of memory
+ */
+
+/*****************************************************************************
+ * Structures to map sound names to ids
+ *****************************************************************************/
+typedef struct _sound_node sound_node;
+
+struct _sound_node
+{
+	char *sound_name;
+	u16b sound_id;
+
+	TREE_ENTRY(_sound_node) sound_tree;
+};
+
+static sound_node *sound_node_new(char *sound_name, u16b sound_id)
+{
+	sound_node *self = mem_zalloc(sizeof *self);
+
+	self->sound_name = string_make(sound_name);
+	self->sound_id = sound_id;
+	return self;
+}
+
+static int sound_node_compare(sound_node *lhs, sound_node *rhs)
+{
+	return (int)strcmp(lhs->sound_name, rhs->sound_name);
+}
+
+typedef TREE_HEAD(_sound_tree, _sound_node) tree_sound;
+
+TREE_DEFINE(_sound_node, sound_tree)
+
+static tree_sound sounds = TREE_INITIALIZER(sound_node_compare);
+/*****************************************************************************/
+
+/*****************************************************************************
+ * Structures to map message ids to sound ids
+ *****************************************************************************/
+typedef struct _msg_sound msg_sound;
+
+struct _msg_sound
+{
+	int sound_id;
+	msg_sound *next;
+};
+
+typedef struct _message_node message_node;
+
+struct _message_node
+{
+	u16b message_id;
+	int num_sounds;
+	msg_sound *first;
+
+	TREE_ENTRY(_message_node) message_tree;
+};
+
+static message_node *message_node_new(u16b message_id)
+{
+	message_node *self = mem_zalloc(sizeof *self);
+
+	self->message_id = message_id;
+
+	return self;
+}
+
+static int message_node_compare(message_node *lhs, message_node *rhs)
+{
+	return (rhs->message_id - lhs->message_id);
+}
+
+typedef TREE_HEAD(_message_tree, _message_node) tree_message;
+
+TREE_DEFINE(_message_node, message_tree)
+
+static tree_message messages = TREE_INITIALIZER(message_node_compare);
+/*****************************************************************************/
+
+/*
+ * After processing the preference files, the 'sounds' AVL Tree will contain
+ * next_sound_id nodes - each representing a sound that needs to be loaded.
+ * We create the sound_data array once we know this information, and then
+ * populate it by calling load_sound_hook() for each node in the tree
+ */
+static u16b next_sound_id;
+static void **sound_data;
+
+/* These are the hooks installed by the platform sound module */
+static struct sound_hooks hooks;
+
+/**
+ * Parse a string of sound names provided by the preferences parser and:
+ *  - Add any new sounds to the 'sound names' tree and allocate them
+ *    unique 'sound ids'
+ *  - Add each sound assigned to a message type to that message types
+ *    'sound map
+ */
+void message_sound_define(u16b message_id, const char *sounds_str)
+{
+	char *search;
+	char *str;
+	char *cur_token;
+	char *next_token;
+
+	sound_node sound_search_node;
+	sound_node *existing_sound;
+	sound_node *new_sound;
+	u16b sound_id;
+
+	message_node message_search_node;
+	message_node *message_map;
+	msg_sound *new_message_sound;
+
+	/* sounds_str is a space separated list of sound names */
+	str = cur_token = string_make(sounds_str);
+
+	search = strchr(cur_token, ' ');
+
+	if (search) {
+		search[0] = '\0';
+		next_token = search + 1;
+	} else {
+		next_token = NULL;
+	}
+
+	if (cur_token) {
+		/* Do we already have a message->sounds mapping for this message ID? */
+		message_search_node.message_id = message_id;
+
+		message_map = TREE_FIND(&messages, _message_node, message_tree, &message_search_node);
+
+		if (!message_map) {
+			/* No - create one */
+			message_map = message_node_new(message_id);
+			TREE_INSERT(&messages, _message_node, message_tree, message_map);
+		}
+	}
+
+	/* Find all the sample names and add them one by one */
+	while (cur_token) {
+		/* Have we already processed this sound name? */
+		sound_search_node.sound_name = cur_token;
+
+		existing_sound = TREE_FIND(&sounds, _sound_node, sound_tree, &sound_search_node);
+
+		if (existing_sound) {
+			/* Yep - Just need to get the ID */
+			sound_id = existing_sound->sound_id;
+		} else {
+			/* Nope - Create a new node to store this sound's ID */
+			sound_id = next_sound_id;
+			new_sound = sound_node_new(cur_token, sound_id);
+			TREE_INSERT(&sounds, _sound_node, sound_tree, new_sound);
+
+			next_sound_id++;
+		}
+
+		/* Add this sound (by id) to the message->sounds map */
+		new_message_sound = mem_zalloc(sizeof *new_message_sound);
+		new_message_sound->sound_id = sound_id;
+		new_message_sound->next = message_map->first;
+		message_map->first = new_message_sound;
+		message_map->num_sounds++;
+
+		/* Figure out next token */
+		cur_token = next_token;
+
+		if (next_token) {
+			/* Try to find a space */
+			search = strchr(cur_token, ' ');
+
+			/* If we can find one, terminate, and set new "next" */
+			if (search) {
+				search[0] = '\0';
+				next_token = search + 1;
+			} else {
+				/* Otherwise prevent infinite looping */
+				next_token = NULL;
+			}
+		}
+	}
+
+	string_free(str);
+}
+
+/**
+ * Play a sound of type "event".
+ */
+static void play_sound(game_event_type type, game_event_data *data, void *user)
+{
+	int s, i, sound_id;
+	message_node message_search_node;
+	message_node *message_map;
+	msg_sound *message_sound;
+
+	int event = data->message.type;
+
+	/* Paranoia */
+	assert(event >= 0);
+
+	message_search_node.message_id = (u16b)event;
+
+	message_map = TREE_FIND(&messages, _message_node, message_tree, &message_search_node);
+
+	if (!message_map)
+		return; /* No sounds for this message */
+
+	/* Choose a random event */
+	message_sound = message_map->first;
+
+	if (!message_sound)
+		return;	/* Oops */
+
+	s = randint0(message_map->num_sounds);
+
+	/*
+	 * Walk the list - possibly inefficient if you define LOTS of sounds
+	 * for LOTS of messages. Not worth using a more 'efficient' data
+	 * structure
+	 */
+	for (i = 0; i < s; i++)
+		if (message_sound->next)
+			message_sound = message_sound->next;
+
+	sound_id = message_sound->sound_id;
+
+	assert((sound_id >= 0) && (sound_id < next_sound_id));
+
+	hooks.play_sound_hook(sound_data[sound_id]);
+}
+
+/**
+ * Call the platform sound modules 'load sound' function
+ */
+static void load_sound(sound_node *self, void *ignore)
+{
+	void *plat_data;
+
+	if (hooks.load_sound_hook) {
+		if(!hooks.load_sound_hook(self->sound_name, &plat_data))
+			plog_fmt("Failed to load sound: %s", self->sound_name);
+		else
+			sound_data[self->sound_id] = plat_data;
+	}
+}
+
+/*
+ * Recursive function to delete sound id's from a node in the 'messages' tree
+ */
+void delete_message_sound(msg_sound *sound)
+{
+	assert(sound);
+
+	if (sound->next)
+		delete_message_sound(sound->next);
+
+	mem_free(sound);
+}
+/*
+ * Shut down the sound system and free resources.
+ */
+static void close_audio(void)
+{
+	int i;
+
+	if (0 == next_sound_id)
+		return;	/* Never opened */
+
+	/*
+	 * Ask the platforms sound module to free resources for each
+	 * sound
+	 */
+	if (hooks.unload_sound_hook)
+		for (i = 0; i < next_sound_id; i++)
+			hooks.unload_sound_hook(sound_data[i]);
+
+	mem_free(sound_data);
+
+	/* Delete the 'sound names' tree */
+	while (sounds.th_root) {
+		mem_free(sounds.th_root->sound_name);
+		TREE_REMOVE(&sounds, _sound_node, sound_tree, sounds.th_root);
+	}
+
+	/* Delete the 'message map' tree */
+	while (messages.th_root) {
+		delete_message_sound(messages.th_root->first);
+		TREE_REMOVE(&messages, _message_node, message_tree, messages.th_root);
+	}
+
+	/* Close the platform's sound module */
+	if (hooks.close_audio_hook)
+		hooks.close_audio_hook();
+}
+
+
+/**
+ * Init the sound "module".
+ */
+errr init_sound(const char *soundstr, int argc, char **argv)
+{
+	int i = 0;
+	bool done = false;
+
+	/* Only initialise the sound sub-system if we have sounds to play */
+	if (0 == next_sound_id)
+		return 0;	/* It's not a fail if no sounds defined */
+
+	/* Try the modules in the order specified by sound_modules[] */
+	while (sound_modules[i].init && !done) {
+		if (!soundstr || streq(soundstr, sound_modules[i].name))
+			if (0 == sound_modules[i].init(&hooks, argc, argv))
+				done = true;
+		i++;
+	}
+
+	/* Check that we have a sound module to use */
+	if (!done)
+		return 1;
+
+	/* Open the platform specific sound system */
+	if (!hooks.open_audio_hook)
+		return 1;
+
+	if (!hooks.open_audio_hook(argc, argv))
+		return 1;
+
+	/* Allocate the array which stores the platform specific sound data */
+	sound_data = mem_zalloc(sizeof(void *) * next_sound_id);
+
+	/* Walk the 'sound names' tree, calling load_sound() for each node */
+	TREE_FORWARD_APPLY(&sounds, _sound_node, sound_tree, load_sound, NULL);
+
+	/* Enable sound */
+	event_add_handler(EVENT_SOUND, play_sound, NULL);
+	atexit(close_audio);
+
+	/* Success */
+	return (0);
+}
+
+/**
+ * Print out the 'help' information for the sound module.
+ */
+void print_sound_help(void)
+{
+	int i;
+
+	for (i = 0; i < (int)N_ELEMENTS(sound_modules); i++)
+		printf("     %s   %s\n", sound_modules[i].name,
+		       sound_modules[i].help);
+}
diff --git a/src/sound.h b/src/sound.h
new file mode 100644
index 0000000..cb49f0d
--- /dev/null
+++ b/src/sound.h
@@ -0,0 +1,38 @@
+/**
+ * \file sound.h
+ * \brief Sound handling
+ *
+ * Copyright (c) 2016 Graeme Russ
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ */
+
+#ifndef INCLUDED_SOUND_H
+#define INCLUDED_SOUND_H
+
+struct sound_hooks
+{
+	bool (*open_audio_hook)(int argc, char **argv);
+	bool (*close_audio_hook)(void);
+
+	/* 'data' is a sound module specific struct */
+	bool (*load_sound_hook)(const char *sound_name, void **data);
+	bool (*unload_sound_hook)(void *data);
+	bool (*play_sound_hook)(void *data);
+};
+
+errr init_sound(const char *soundstr, int argc, char **argv);
+
+void message_sound_define(u16b type, const char *sounds);
+
+void print_sound_help(void);
+
+#endif /* !INCLUDED_SOUND_H */
diff --git a/src/ui-prefs.c b/src/ui-prefs.c
index cff07cf..e32ba72 100644
--- a/src/ui-prefs.c
+++ b/src/ui-prefs.c
@@ -34,6 +34,7 @@
 #include "ui-keymap.h"
 #include "ui-prefs.h"
 #include "ui-term.h"
+#include "sound.h"

 int arg_graphics;			/* Command arg -- Request graphics mode */
 bool arg_graphics_nice;		/* Command arg -- Request nice graphics mode */
@@ -1047,6 +1048,29 @@ static enum parser_error parse_prefs_window(struct parser *p)
 	return PARSE_ERROR_NONE;
 }

+static enum parser_error parse_prefs_sound(struct parser *p)
+{
+	int msg_index;
+	const char *type;
+	const char *sounds;
+
+	struct prefs_data *d = parser_priv(p);
+	assert(d != NULL);
+	if (d->bypass) return PARSE_ERROR_NONE;
+
+	type = parser_getsym(p, "type");
+	sounds = parser_getstr(p, "sounds");
+
+	msg_index = message_lookup_by_name(type);
+
+	if (msg_index < 0)
+		return PARSE_ERROR_INVALID_MESSAGE;
+
+	message_sound_define(msg_index, sounds);
+
+	return PARSE_ERROR_NONE;
+}
+
 static struct parser *init_parse_prefs(bool user)
 {
 	struct parser *p = parser_new();
@@ -1074,6 +1098,7 @@ static struct parser *init_parse_prefs(bool user)
 	parser_reg(p, "message sym type sym attr", parse_prefs_message);
 	parser_reg(p, "color uint idx int k int r int g int b", parse_prefs_color);
 	parser_reg(p, "window int window uint flag uint value", parse_prefs_window);
+	parser_reg(p, "sound sym type str sounds", parse_prefs_sound);

 	return p;
 }