View difference between Paste ID: iyPnNR1C and NLKCa01J

 ; sound generation:
 ; two output channels buffers
 ; four software channels
 ; first two hard-panned to left, second two hard-panned to right
 ; each channel switchable between either pulse, triangle, saw, and noise
 ; 16-bit oscilators and frequencies for each channel
 ; 4-bit fine tuners for each channel
 ; 8-bit volumes for each channel
 ; 8-bit duty cycle settings for each channel
 ; enable bits for each channel
 ;
 ; music generation:
 ; tempo
 ; ticks per frame
 ; repeat section
 ; each channel has three notes that are arpeggiated to modulate the target frequency
 ; each channel has its own target frequency
 ; each channel has its own frequency sweep speed which is the amount added or substracted from the channel frequency per tick until the target frequency is reached
 ; each channel has its own target volume
 ; each channel has its own volume sweep speed which is the amount added or substracted from the channel volume per tick until the target volume is reached
 ; each channel has its own vibrato settings split between depth and rate which control the effective target frequency
 ; each channel has its own tremolo settings split between depth and rate which control the effective target volume
 ; each channel has its own effect that is to be applied per tick
 ;
 ; song format:
 ; 0x00 - tempo
 ; 0x01 - ticks per frame
 ; 0x02 - repeat low
 ; 0x03 - repeat high
 ; [0x10 - end] - frames
 ;
 ; frame format:
 ; first byte - note
 ; second byte - volume
 ; third byte - effect
 ; fourth byte - arppegio
 ;
 ; effect format:
 ; first nybble - effect
 ; second nybble - argument
 ;
 ; note format:
 ; first nybble - note
 ; second nybble - octave
 ;
 ; notes:
 ; 0x0 - null
 ; 0x1 - same as root (for arppegio notes)
 ; 0x2 - stop
 ; 0x3 - revive
 ; 0x4 - C
 ; 0x5 - C#
 ; 0x6 - D
 ; 0x7 - D#
 ; 0x8 - E
 ; 0x9 - F
 ; 0xA - F#
 ; 0xB - G
 ; 0xC - G#
 ; 0xD - A
 ; 0xE - A#
 ; 0xF - B
 ;
 ; arppegio format:
 ; first nybble - note 2 (above octave of note 1)
 ; second nybble - note 3 (above octave of note 1)
 ;
 ; effects:
 ; 0 - null
 ; 1 - stop effect
 ; 2 - set vibrato rate
 ; 3 - set vibrato depth
 ; 4 - set tremolo rate
 ; 5 - set tremolo depth
 ; 6 - portamento to note
 ; 7 - volume slide
 ; 8 - increment duty cycle
 ; 9 - set duty cycle
 ; A - set waveform
 ; B - increment volume
 ; C - decrement volume
 ; D - set finetune
 
 .define NOTE_C 262
 .define NOTE_Cs 277
 .define NOTE_D 294
 .define NOTE_Ds 311
 .define NOTE_E 330
 .define NOTE_F 349
 .define NOTE_Fs 370
 .define NOTE_G 392
 .define NOTE_Gs 415
 .define NOTE_A 440
 .define NOTE_As 466
 .define NOTE_B 494
 
 .def LEFT_BUF = r2
 .def RIGHT_BUF = r3
 
 .def CHAN1_OSCL = r4
 .def CHAN1_OSCH = r5
 .def CHAN2_OSCL = r6
 .def CHAN2_OSCH = r7
 .def CHAN3_OSCL = r8
 .def CHAN3_OSCH = r9
 .def CHAN4_OSCL = r10
 .def CHAN4_OSCH = r11
 
 .def CHAN1_FRQL = r12
 .def CHAN1_FRQH = r13
 .def CHAN2_FRQL = r14
 .def CHAN2_FRQH = r15
 .def CHAN3_FRQL = r24
 .def CHAN3_FRQH = r25
 .def CHAN4_FRQL = r26
 .def CHAN4_FRQH = r27
 
 .def NOISEL = r0
 .def NOISEH = r1
 
 .def EFF_DIR = r18
 
 .NOLIST
 .include "m48def.inc"
 .LIST
 
 .cseg
 .org 0x00
 	rjmp start
 
 .org 0x09
 	rjmp timer
 
 .org 0x40
 start:
 	ldi r16, LOW(RAMEND)
 	out spl, r16
 	ldi r16, HIGH(RAMEND)
 	out sph, r16
 
 	ldi r16, 1
 	sts TIMSK2, r16
 	ldi r16, 0b001
 	sts TCCR2B, r16
 
 	ldi r16, 0xFF
 	out ddrd, r16
 	out ddrc, r16
 
 	ldi r16, 0xFF
 	mov LEFT_BUF, r16
 	mov RIGHT_BUF, r16
 
 	ldi r16, 0x01
-	ldi r16, 0b1111
+
 	ldi r16, 0x00
 	mov NOISEH, r16
 
 	ldi r16, 0b0000
-	ldi r16, 0x06
+
 
 	ldi r16, 0x08
-	ldi r16, 0x2F
+
 	ldi r16, 0x04
 	sts speed, r16
 
 	ldi r16, 0x00
 	sts chan1_eff, r16
-	ldi r16, 0x1F
+
 	sts chan3_eff, r16
 	sts chan4_eff, r16
 
 	ldi r16, 0x0F
 	sts chan1_vib, r16
 	sts chan2_vib, r16
 	sts chan3_vib, r16
 	sts chan4_vib, r16
 
 	ldi r16, 0x0F
 	sts chan1_trm, r16
-	ldi r16, 0x40
+
 	sts chan3_trm, r16
 	sts chan4_trm, r16
 
 	ldi r16, 0x80
 	sts chan1_tvol, r16
 	sts chan2_tvol, r16
 	sts chan3_tvol, r16
 	sts chan4_tvol, r16
 
 	ldi r16, 0x80
 	sts chan1_dut, r16
-	ldi r16, 0x64
+
 	sts chan3_dut, r16
 	sts chan4_dut, r16
 
 	ldi r16, 0x44
 	sts chan1_notes, r16
 	sts chan2_notes, r16
 	sts chan3_notes, r16
 	sts chan4_notes, r16
 
 	ldi r16, 0x00
 	sts chan1_notes + 1, r16
 	sts chan2_notes + 1, r16
 	sts chan3_notes + 1, r16
 	sts chan4_notes + 1, r16
 
 	ldi r16, 0b00000000
 	sts waveform, r16
 
 	ldi ZL, LOW(song_data << 1)
 	ldi ZH, HIGH(song_data << 1)
 
 	sei
 
 loop:
 	rjmp loop
 
 note_freq:
 	mov r16, r19
 	lsr r16
 	lsr r16
 	lsr r16
 	lsr r16
 	cpi r16, 0x04
 	breq setc
 	cpi r16, 0x05
 	breq setcs
 	cpi r16, 0x06
 	breq setd
 	cpi r16, 0x07
 	breq setds
 	cpi r16, 0x08
 	breq sete
 	cpi r16, 0x09
 	breq setf
 	cpi r16, 0x0A
 	breq setfs
 	cpi r16, 0x0B
 	breq setg
 	cpi r16, 0x0C
 	breq setgs
 	cpi r16, 0x0D
 	breq seta
 	cpi r16, 0x0E
 	breq setas
 	cpi r16, 0x0F
 	breq setb
 	ret
 setc:
 	ldi r16, LOW(NOTE_C)
 	ldi r17, HIGH(NOTE_C)
 	rjmp skip4
 setcs:
 	ldi r16, LOW(NOTE_Cs)
 	ldi r17, HIGH(NOTE_Cs)
 	rjmp skip4
 setd:
 	ldi r16, LOW(NOTE_D)
 	ldi r17, HIGH(NOTE_D)
 	rjmp skip4
 setds:
 	ldi r16, LOW(NOTE_Ds)
 	ldi r17, HIGH(NOTE_Ds)
 	rjmp skip4
 sete:
 	ldi r16, LOW(NOTE_E)
 	ldi r17, HIGH(NOTE_E)
 	rjmp skip4
 setf:
 	ldi r16, LOW(NOTE_F)
 	ldi r17, HIGH(NOTE_F)
 	rjmp skip4
 setfs:
 	ldi r16, LOW(NOTE_Fs)
 	ldi r17, HIGH(NOTE_Fs)
 	rjmp skip4
 setg:
 	ldi r16, LOW(NOTE_G)
 	ldi r17, HIGH(NOTE_G)
 	rjmp skip4
 setgs:
 	ldi r16, LOW(NOTE_Gs)
 	ldi r17, HIGH(NOTE_Gs)
 	rjmp skip4
 seta:
 	ldi r16, LOW(NOTE_A)
 	ldi r17, HIGH(NOTE_A)
 	rjmp skip4
 setas:
 	ldi r16, LOW(NOTE_As)
 	ldi r17, HIGH(NOTE_As)
 	rjmp skip4
 setb:
 	ldi r16, LOW(NOTE_B)
 	ldi r17, HIGH(NOTE_B)
 	rjmp skip4
 skip4:
 	andi r19, 0x0F
 	cpi r19, 0x01
 	breq seto1
 	cpi r19, 0x02
 	breq seto2
 	cpi r19, 0x03
 	breq seto3
 	cpi r19, 0x04
 	breq seto4
 	cpi r19, 0x05
 	breq seto5
 	cpi r19, 0x06
 	breq seto6
 	cpi r19, 0x07
 	breq seto7
 	cpi r19, 0x08
 	breq seto8
 	ret
 seto1:
 	lsr r17
 	ror r16
 	lsr r17
 	ror r16
 	lsr r17
 	ror r16
 	ret
 seto2:
 	lsr r17
 	ror r16
 	lsr r17
 	ror r16
 	ret
 seto3:
 	lsr r17
 	ror r16
 	ret
 seto4:
 	ret
 seto5:
 	lsl r16
 	rol r17
 	ret
 seto6:
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	ret
 seto7:
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	ret
 seto8:
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	lsl r16
 	rol r17
 	ret
 
 track:
 	cpi ZH, HIGH(song_end << 1)
 	brlo continue
 	brne loopback
 	cpi ZL, LOW(song_end << 1)
 	brlo continue
 loopback:
 	ldi ZL, LOW(song_data << 1)
 	ldi ZH, HIGH(song_data << 1)
 continue:
 	ldi r20, 0b0001
 	rcall load_command
 	ldi r20, 0b0010
 	rcall load_command
 	ldi r20, 0b0100
 	rcall load_command
 	ldi r20, 0b1000
 	rcall load_command
 	ret
 
 load_command:
 	lpm r19, Z+
 	rcall handle_note
 	lpm r19, Z+
 	rcall handle_volume
 	lpm r19, Z+
 	rcall handle_effect
 	lpm r19, Z+
 	rcall handle_arps
 	ret
 
 handle_note:
 	mov r16, r19
 	lsr r16
 	lsr r16
 	lsr r16
 	lsr r16
 	cpi r16, 0x00
 	breq end_note
 	cpi r16, 0x01
 	breq end_note
 	cpi r16, 0x02
 	breq stop_note
 	cpi r16, 0x03
 	breq start_note
 	sbrc r20, 0
 	sts chan1_notes, r19
 	sbrc r20, 1
 	sts chan2_notes, r19
 	sbrc r20, 2
 	sts chan3_notes, r19
 	sbrc r20, 3
 	sts chan4_notes, r19
 	rjmp start_note
 stop_note:
 	lds r21, enable
 	sbrc r20, 0
 	andi r21, 0b1110
 	sbrc r20, 1
 	andi r21, 0b1101
 	sbrc r20, 2
 	andi r21, 0b1011
 	sbrc r20, 3
 	andi r21, 0b0111
 	sts enable, r21
 	ret
 start_note:
 	lds r21, enable
 	sbrc r20, 0
 	ori r21, 0b0001
 	sbrc r20, 1
 	ori r21, 0b0010
 	sbrc r20, 2
 	ori r21, 0b0100
 	sbrc r20, 3
 	ori r21, 0b1000
 	sts enable, r21
 	ret
 end_note:
 	ret
 
 handle_volume:
 	cpi r19, 0x00
 	breq end_vol
 	sbrc r20, 0
 	sts chan1_tvol, r19
 	sbrc r20, 1
 	sts chan2_tvol, r19
 	sbrc r20, 2
 	sts chan3_tvol, r19
 	sbrc r20, 3
 	sts chan4_tvol, r19
 end_vol:
 	ret
 
 handle_effect:
 	cpi r19, 0x00
 	breq end_eff
 	sbrc r20, 0
 	sts chan1_eff, r19
 	sbrc r20, 1
 	sts chan2_eff, r19
 	sbrc r20, 2
 	sts chan3_eff, r19
 	sbrc r20, 3
 	sts chan4_eff, r19
 end_eff:
 	ret
 
 handle_arps:
 	sbrc r20, 0
 	sts chan1_notes + 1, r19
 	sbrc r20, 1
 	sts chan2_notes + 1, r19
 	sbrc r20, 2
 	sts chan3_notes + 1, r19
 	sbrc r20, 3
 	sts chan4_notes + 1, r19
 	ret
 
 arpeggio:
 	mov r21, r19
 	andi r21, 0xF0
 	cpi r16, 1
 	breq first
 	cpi r16, 2
 	breq second
 	ret
 first:
 	andi r20, 0xF0
 	andi r19, 0x0F
 	cpi r20, 4
 	brlo nope2
 	cp r21, r20
 	brlo nope
 	inc r19
 nope:
 	or r19, r20
 	ret
 second:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	andi r19, 0x0F
 	cpi r20, 4
 	brlo nope2
 	cp r21, r20
 	brlo nope
 	inc r19
 nope2:
 	or r19, r21
 	ret
 
 music:
 	clr r18
 	sts music_timer, r18
 	sts music_timer + 1, r18
 
 	lds r16, tick_timer
 	mov r17, r16
 	lsr r17
 	lsr r17
 	lsr r17
 	lsr r17
 	andi r16, 0x0F
 	inc r17
 	lds r18, speed
 	cp r17, r18
 	brlo no_track
 	rcall track
 	clr r17
 	rjmp okay
 no_track:
 	lsl r17
 	lsl r17
 	lsl r17
 	lsl r17
 okay:
 	push r16
 	push r17
 
 	lds r22, waveform
 
 	lds r16, chan1_eff
 	lds r17, chan1_trm
 	lds r18, chan1_vib
 	lds r19, chan1_dut
 	lds r23, chan1_tvol
 	rcall apply_effect
 	sts chan1_trm, r17
 	sts chan1_vib, r18
 	sts chan1_dut, r19
 	sts chan1_tvol, r23
 	sbrs r21, 3
 	rjmp skipwav1
 	andi r21, 0b0011
 	andi r22, 0b11111100
 	or r22, r21
 skipwav1:
 
 	lds r16, chan2_eff
 	lds r17, chan2_trm
 	lds r18, chan2_vib
 	lds r19, chan2_dut
 	lds r23, chan2_tvol
 	lsr r21
 	lsr r21
 	rcall apply_effect
 	sts chan2_trm, r17
 	sts chan2_vib, r18
 	sts chan2_dut, r19
 	sts chan2_tvol, r23
 	sbrs r21, 3
 	rjmp skipwav2
 	andi r21, 0b0011
 	andi r22, 0b11110011
 	lsl r21
 	lsl r21
 	or r22, r21
 skipwav2:
 
 	lds r16, chan3_eff
 	lds r17, chan3_trm
 	lds r18, chan3_vib
 	lds r19, chan3_dut
 	lds r23, chan3_tvol
 	rcall apply_effect
 	sts chan3_trm, r17
 	sts chan3_vib, r18
 	sts chan3_dut, r19
 	sts chan3_tvol, r23
 	sbrs r21, 3
 	rjmp skipwav3
 	andi r21, 0b0011
 	andi r22, 0b11001111
 	lsl r21
 	lsl r21
 	lsl r21
 	lsl r21
 	or r22, r21
 skipwav3:
 
 	lds r16, chan4_eff
 	lds r17, chan4_trm
 	lds r18, chan4_vib
 	lds r19, chan4_dut
 	lds r23, chan4_tvol
 	rcall apply_effect
 	sts chan4_trm, r17
 	sts chan4_vib, r18
 	sts chan4_dut, r19
 	sts chan4_tvol, r23
 	sbrs r21, 3
 	rjmp skipwav4
 	andi r21, 0b0011
 	andi r22, 0b00111111
 	lsl r21
 	lsl r21
 	lsl r21
 	lsl r21
 	lsl r21
 	lsl r21
 	or r22, r21
 skipwav4:
 	sts waveform, r22
 
 	pop r17
 	pop r16
 
 	lds r18, fine_tune
 
 	push r17
 	push r16
 
 	lds r19, chan1_notes
 	lds r20, chan1_notes + 1
 	rcall arpeggio
 	rcall note_freq
 
 	lds r21, chan1_vib
 	mov r22, CHAN1_FRQL
 	mov r23, CHAN1_FRQH
 
 	rcall sweep
 
 	mov CHAN1_FRQL, r22
 	mov CHAN1_FRQH, r23
 
 	mov r19, r18
 	andi r19, 0x0F
 	add CHAN1_FRQL, r19
 
 	pop r16
 	push r16
 
 	lds r19, chan2_notes
 	lds r20, chan2_notes + 1
 	rcall arpeggio
 	rcall note_freq
 
 	lds r21, chan2_vib
 	mov r22, CHAN2_FRQL
 	mov r23, CHAN2_FRQH
 
 	rcall sweep
 
 	mov CHAN2_FRQL, r22
 	mov CHAN2_FRQH, r23
 
 	lsr r18
 	lsr r18
 	lsr r18
 	lsr r18
 	add CHAN2_FRQL, r18
 
 	lds r18, fine_tune + 1
 
 	pop r16
 	push r16
 
 	lds r19, chan3_notes
 	lds r20, chan3_notes + 1
 	rcall arpeggio
 	rcall note_freq
 
 	lds r21, chan3_vib
 	mov r22, CHAN3_FRQL
 	mov r23, CHAN3_FRQH
 
 	rcall sweep
 
 	mov CHAN3_FRQL, r22
 	mov CHAN3_FRQH, r23
 
 	mov r19, r18
 	andi r19, 0x0F
 	add CHAN3_FRQL, r19
 
 	pop r16
 	push r16
 
 	lds r19, chan4_notes
 	lds r20, chan4_notes + 1
 	rcall arpeggio
 	rcall note_freq
 
 	lds r21, chan4_vib
 	mov r22, CHAN4_FRQL
 	mov r23, CHAN4_FRQH
 
 	rcall sweep
 
 	mov CHAN4_FRQL, r22
 	mov CHAN4_FRQH, r23
 
 	lsr r18
 	lsr r18
 	lsr r18
 	lsr r18
 	add CHAN4_FRQL, r18
 
 	pop r16
 	pop r17
 
 	inc r16
 	cpi r16, 3
 	brlo lower
 	clr r16
 lower:
 	or r17, r16
 	sts tick_timer, r17
 
 	lds r16, chan1_trm
 	lds r17, chan1_vol
 	lds r18, chan1_tvol
 	rcall vol_sweep
 	sts chan1_vol, r17
 
 	lds r16, chan2_trm
 	lds r17, chan2_vol
 	lds r18, chan2_tvol
 	rcall vol_sweep
 	sts chan2_vol, r17
 
 	lds r16, chan3_trm
 	lds r17, chan3_vol
 	lds r18, chan3_tvol
 	rcall vol_sweep
 	sts chan3_vol, r17
 
 	lds r16, chan4_trm
 	lds r17, chan4_vol
 	lds r18, chan4_tvol
 	rcall vol_sweep
 	sts chan4_vol, r17
 
 	ret
 
 apply_effect:
 	clr r21
 	mov r20, r16
 	lsr r16
 	lsr r16
 	lsr r16
 	lsr r16
 	andi r20, 0x0F
 
 	cpi r16, 0x2
 	breq set_vib_rate
 	cpi r16, 0x3
 	breq set_vib_depth
 	cpi r16, 0x4
 	breq set_trm_rate
 	cpi r16, 0x5
 	breq set_trm_depth
 	cpi r16, 0x6
 	breq set_portamento
 	cpi r16, 0x7
 	breq set_vol_slide
 	cpi r16, 0x8
 	breq inc_dut
 	cpi r16, 0x9
 	breq set_dut
 	cpi r16, 0xA
 	breq set_wav
 	cpi r16, 0xB
 	breq inc_vol
 	cpi r16, 0xC
 	breq dec_vol
 	ret
 set_vib_rate:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	andi r18, 0x0F
 	or r18, r20
 	ret
 set_vib_depth:
 	andi r18, 0xF0
 	or r18, r20
 	ret
 set_trm_rate:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	andi r17, 0x0F
 	or r17, r20
 	ret
 set_trm_depth:
 	andi r17, 0xF0
 	or r17, r20
 	ret
 set_portamento:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	mov r18, r20
 	ret
 set_vol_slide:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	mov r17, r20
 	ret
 inc_dut:
 	add r19, r20
 	ret
 set_dut:
 	lsl r20
 	lsl r20
 	lsl r20
 	lsl r20
 	mov r19, r20
 	ret
 set_wav:
 	ldi r21, 0b1000
 	or r21, r20
 	ret
 inc_vol:
 	add r23, r20
 	brcs inc_vol1
 	ret
 inc_vol1:
 	ldi r23, 0xFF
 	ret
 dec_vol:
 	sub r23, r20
 	brcs dec_vol1
 	ret
 dec_vol1:
 	ldi r23, 0x00
 	ret
 
 vol_sweep:
 	lsr r16
 	lsr r16
 	lsr r16
 	lsr r16
 	cpi r16, 0
 	breq vol_equal
 	cp r17, r18
 	brlo vol_smaller
 	cp r18, r17
 	brlo vol_bigger
 	rjmp vol_equal
 vol_smaller:
 	add r17, r16
 	cp r18, r17
 	brlo vol_equal
 	ret
 vol_bigger:
 	sub r17, r16
 	cp r17, r18
 	brlo vol_equal
 	ret
 vol_equal:
 	mov r17, r18
 	ret
 
 sweep:
 	lsr r21
 	lsr r21
 	lsr r21
 	lsr r21
 	lsl r21
 	cpi r21, 0
 	breq equal
 	cp r23, r17
 	brlo smaller
 	cp r17, r23
 	brlo bigger
 	cp r22, r16
 	brlo smaller
 	cp r16, r22
 	brlo bigger
 	rjmp equal
 bigger:
 	sub r22, r21
 	brcc yeah
 	dec r23
 yeah:
 	rjmp done_big
 done_big:
 	cp r23, r17
 	brlo equal
 	cp r17, r23
 	brlo return2
 	cp r22, r16
 	brlo equal
 	rjmp return2
 smaller:
 	clr r19
 	add r22, r21
 	adc r23, r19
 	rjmp done_small
 done_small:
 	cp r23, r17
 	brlo return2
 	cp r17, r23
 	brlo equal
 	cp r22, r16
 	brlo return2
 	cp r16, r22
 	brlo equal
 	rjmp return2
 equal:
 	mov r22, r16
 	mov r23, r17
 return2:
 	ret
 
 timer:
 	mov r16, LEFT_BUF
 	lsr r16
 	lsr r16
 	mov r17, RIGHT_BUF
 	lsr r17
 	lsr r17
 	out portd, r16
 	out portc, r17
 
 	lds r16, music_timer
 	lds r17, music_timer + 1
 	ldi r18, 0
 	ldi r19, 1
 	add r16, r19
 	adc r17, r18
 	sts music_timer, r16
 	sts music_timer + 1, r17
 	lds r18, tempo
 	cp r17, r18
 	brlo no_music
 	rcall music
 
 no_music:
 	clr LEFT_BUF
 	clr RIGHT_BUF
 
 	add CHAN1_OSCL, CHAN1_FRQL
 	adc CHAN1_OSCH, CHAN1_FRQH
 	add CHAN2_OSCL, CHAN2_FRQL
 	adc CHAN2_OSCH, CHAN2_FRQH
 	add CHAN3_OSCL, CHAN3_FRQL
 	adc CHAN3_OSCH, CHAN3_FRQH
 	add CHAN4_OSCL, CHAN4_FRQL
 	adc CHAN4_OSCH, CHAN4_FRQH
 
 	lds r16, waveform
 	lds r22, enable
 
 	mov r18, r16
 	andi r18, 0b00000011
 	mov r19, CHAN1_OSCH
 	lds r20, chan1_vol
 	lds r21, chan1_dut
 	rcall generate
 	sbrc r22, 0
 	add LEFT_BUF, r17
 
 	lsr r16
 	lsr r16
 	mov r18, r16
 	andi r18, 0b00000011
 	mov r19, CHAN2_OSCH
 	lds r20, chan2_vol
 	lds r21, chan2_dut
 	rcall generate
 	sbrc r22, 1
 	add LEFT_BUF, r17
 
 	lsr r16
 	lsr r16
 	mov r18, r16
 	andi r18, 0b00000011
 	mov r19, CHAN3_OSCH
 	lds r20, chan3_vol
 	lds r21, chan3_dut
 	rcall generate
 	sbrc r22, 2
 	add RIGHT_BUF, r17
 
 	lsr r16
 	lsr r16
 	mov r18, r16
 	andi r18, 0b00000011
 	mov r19, CHAN4_OSCH
 	lds r20, chan4_vol
 	lds r21, chan4_dut
 	rcall generate
 	sbrc r22, 3
 	add RIGHT_BUF, r17
 
 	reti
 
 generate:
 	clr r17
 	cpi r18, 0b00
 	breq gen_pulse
 	cpi r18, 0b01
 	breq gen_triangle
 	cpi r18, 0b10
 	breq gen_saw
 	cpi r18, 0b11
 	breq gen_noise
 	ret
 
 gen_pulse:
 	cp r19, r21
 	brlo return
 	mov r17, r20
 	lsr r17
 	lsr r17
 	ret
 
 gen_triangle:
 	mov r17, r19
 	sbrc r19, 7
 	com r17
 	rjmp apply_volume
 	ret
 
 gen_saw:
 	mov r17, r19
 	lsr r17
 	lsr r17
 	rjmp apply_volume
 	ret
 
 gen_noise:
 	clr r21
 	clr r19
 	sbrc NOISEH, 6
 	ser r21
 	sbrc NOISEL, 3
 	ser r19
 	eor r19, r21
 	clr r21
 	lsl NOISEH
 	lsl NOISEL
 	adc NOISEH, r21
 	sbrc r19, 0
 	inc NOISEL
 	mov r17, NOISEL
 	lsr r17
 	rjmp apply_volume
 	ret
 
 apply_volume:
 	sbrc r20, 7
 	rjmp return
 	lsr r17
 	sbrc r20, 6
 	rjmp return
 	lsr r17
 	sbrc r20, 5
 	rjmp return
 	lsr r17
 	sbrc r20, 4
 	rjmp return
 	lsr r17
 	sbrc r20, 3
 	rjmp return
 	lsr r17
 	sbrc r20, 2
 	rjmp return
 	lsr r17
 	sbrc r20, 1
 	rjmp return
 	lsr r17
 return:
 	ret
 
 song_data:
 	.db 0x00, 0x00, 0xA0, 0x00 ; pulse 1
 	.db 0x00, 0x00, 0xA0, 0x00 ; pulse 2
 	.db 0x00, 0x00, 0xA1, 0x00 ; triangle
 	.db 0x00, 0x00, 0xA3, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0xCf, 0x00 ; pulse 1
 	.db 0x42, 0xFF, 0x88, 0x00 ; pulse 2
 	.db 0xB4, 0x70, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x92, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x00, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0xCf, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x00, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x73, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0xE3, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x42, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x80, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x64, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x63, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x80, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x74, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0xC3, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xE1, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x94, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x80, 0x00, 0x00 ; pulse 1
 	.db 0xE2, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x30, 0x00, 0x00 ; pulse 1
 	.db 0x63, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x94, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0xE4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0xE2, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0xE4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0xB3, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xF1, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x80, 0x00, 0x00 ; pulse 1
 	.db 0xF2, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x30, 0x00, 0x00 ; pulse 1
 	.db 0x63, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0xF2, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x95, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 
 	.db 0x00, 0x00, 0x92, 0x00 ; pulse 1
 	.db 0x42, 0xFF, 0x88, 0x00 ; pulse 2
 	.db 0xB4, 0x70, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x00, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0xCf, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x00, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x73, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0xE3, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x42, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x64, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x74, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x63, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x64, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x44, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x43, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0x94, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x92, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xC4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x80, 0x00, 0x00 ; pulse 1
 	.db 0x93, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x30, 0x00, 0x00 ; pulse 1
 	.db 0xC3, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xC4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x00, 0x00, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0xB4, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x93, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x75, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0xC4, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x45, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 
 	.db 0xB4, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xB2, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0xB5, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x94, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xB3, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xB5, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x95, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x20, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x74, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xF3, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0xF4, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x75, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x64, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0xB3, 0xFF, 0x00, 0x00 ; pulse 2
 	.db 0x95, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 
 	.db 0x65, 0xFF, 0x00, 0x00 ; pulse 1
 	.db 0x00, 0xAA, 0x00, 0x00 ; pulse 2
 	.db 0x65, 0x00, 0x00, 0x00 ; triangle
 	.db 0x00, 0x00, 0x00, 0x00 ; noise
 song_end:
 
 .dseg
 chan1_vol: .byte 1
 chan2_vol: .byte 1
 chan3_vol: .byte 1
 chan4_vol: .byte 1
 
 chan1_dut: .byte 1
 chan2_dut: .byte 1
 chan3_dut: .byte 1
 chan4_dut: .byte 1
 
 fine_tune: .byte 2
 waveform: .byte 1
 enable: .byte 1
 music_timer: .byte 2
 tick_timer: .byte 1
 
 tempo: .byte 1
 speed: .byte 1
 
 chan1_tvol: .byte 1
 chan2_tvol: .byte 1
 chan3_tvol: .byte 1
 chan4_tvol: .byte 1
 
 chan1_notes: .byte 2
 chan2_notes: .byte 2
 chan3_notes: .byte 2
 chan4_notes: .byte 2
 
 chan1_vib: .byte 1
 chan2_vib: .byte 1
 chan3_vib: .byte 1
 chan4_vib: .byte 1
 
 chan1_trm: .byte 1
 chan2_trm: .byte 1
 chan3_trm: .byte 1
 chan4_trm: .byte 1
 
 chan1_eff: .byte 1
 chan2_eff: .byte 1
 chan3_eff: .byte 1
 chan4_eff: .byte 1