Dual-card ALSA Configuration

Sound in Linux can be a pain to get right. Thusly, I’ve attached my (functional) configuration for multiple soundcards in ALSA for reference below:

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# Set default sound card
# Useful so that all settings can be changed to a different card here.
pcm.av710spdif {
type hw
card 2
device 1
}
pcm.realtek {
type hw
card 0
# device 0
}
pcm.!default {
type plug
slave.pcm "av710duplex"
}
pcm.monitor {
type plug
ttable.0.10 1 # digital mix left
ttable.1.11 1 # digital mix right
slave.pcm "av710spdif"
}
# Allow mixing of multiple output streams to this device
pcm.av710output {
type dmix
ipc_key 1024
ipc_perm 0660 # Sound for everybody in your group!
slave.pcm "av710spdif"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
format S32_LE
period_time 0
period_size 1024
buffer_size 8192
rate 44100
}
bindings {
0 0
1 1
}
}
# Allow reading from the default device.
# Also known as record or capture.
pcm.av710input {
type dsnoop
ipc_key 2048
slave.pcm "av710spdif"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
format S32_LE
period_time 0
period_size 1024
buffer_size 8192
rate 44100
}
bindings {
0 0
1 1
}
}
# This is what we want as our default device
# a fully duplex (read/write) audio device.
pcm.av710duplex {
type asym
playback.pcm "av710output"
capture.pcm "av710input"
}
# Allow mixing of multiple output streams to this device
pcm.realtekoutput {
type dmix
ipc_key 3096
ipc_perm 0660 # Sound for everybody in your group!
slave.pcm "realtek"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
# format S32_LE
period_time 0
period_size 1024
buffer_size 8192
rate 44100
}
bindings {
0 0
1 1
}
}
# Allow reading from the default device.
# Also known as record or capture.
pcm.realtekinput {
type dsnoop
ipc_key 4096
slave.pcm "realtek"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
# format S32_LE
period_time 0
period_size 1024
buffer_size 8192
rate 44100
}
bindings {
0 0
1 1
}
}
# This is what we want as our default device
# a fully duplex (read/write) audio device.
pcm.realtekduplex {
type asym
playback.pcm "realtekoutput"
capture.pcm "realtekinput"
}