alsa multiplex/multiuser Steam/Mumble config

# cat /proc/asound/cards
#
# 0 [PCH            ]: HDA-Intel - HDA Intel PCH
#                       HDA Intel PCH at 0xfbff8000 irq 39
# 1 [NVidia         ]: HDA-Intel - HDA NVidia
#                       HDA NVidia at 0xfaffc000 irq 17
# 2 [Headset        ]: USB-Audio - Logitech Wireless Headset
#                     Logitech Logitech Wireless Headset at usb-0000:00:1a.0-1.1.4.4, full speed
# ^
# |_______________ alsa card index


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::::::::::::::::::::::::::::::::       /etc/asound.conf         ::::::::::::::::::::::::::::::::
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# this makes a "device" for multiplexing by specifying the alsa device number?
# Logitech USB headset w/mic
pcm.foomix {
    type dmix
    ipc_key 1024
    ipc_key_add_uid 0
    slave.pcm "hw:2,0"
}

# I don't know what a dsnoop is used for but it's in many examples
pcm.foosnoop {
    type dsnoop
    ipc_key 1025
    slave.pcm "hw:2,0"
}

# multiplex device "fooplex" using the logitech headset
pcm.fooplex {
    type asym
    playback.pcm "foomix"
    capture.pcm "foosnoop"
}

# "PCH" speaker/mic output on the back of my computer
pcm.dmixed {
    type dmix
    ipc_key 1024
    ipc_key_add_uid 0
    slave.pcm "hw:0,0"
}

# snoop device for "PCH" speaker/mic
pcm.dsnooped {
    type dsnoop
    ipc_key 1025
    slave.pcm "hw:0,0"
}

# multiple device for "PCH" speaker/mic
pcm.duplex {
    type asym
    playback.pcm "dmixed"
    capture.pcm "dsnooped"
}

# Instruct ALSA to use "PCH" as the default device
# can override the default in each user's ~/.asoundrc
pcm.!default {
    type plug
    slave.pcm "duplex"
}
ctl.!default {
    type hw
    card 0
}


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::: /home/steamuser/.asoundrc      ::::::::::::::::::::::::::::::::
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# Steam and Mumble are run using sudo to "steamuser"
# we want to use Logitech headset for Mumble and Steam. Multiplex device allows for this
# "steamuser" must be in audio group (and possibly plugdev group?)
#
# the Mumble Audio Tuning Wizard config settings
# https://imgur.com/ojRJPVul.png
pcm.!default {
    type plug
    slave.pcm "fooplex"
}

# Logitech headset is hw 2
ctl.!default {
    type hw
    card 2
}


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::: /home/firefox/.asoundrc        ::::::::::::::::::::::::::::::::
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
# sudo to "firefox" user for running web browser
# if empty/commented out, then uses defaults from /etc/asound.conf
# if we want to use headphones to listen to youtube at night, then uncomment the lines below
# it is just a copy of "steamuser" setup
# seems like re-sudo to "firefox" user should work after changing file but I had to restart
# computer to get it to work. Not sure what the problem is
#
# pcm.!default {
#    type plug
#    slave.pcm "fooplex"
#}
#ctl.!default {
#    type hw
#    card 2
#}