seeed-voicecard/asound_2mic.conf

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# The IPC key of dmix or dsnoop plugin must be unique
# If 555555 or 666666 is used by other processes, use another one
pcm.!default {
type asym
playback.pcm "playback"
capture.pcm "capture"
}
pcm.playback {
type plug
slave.pcm "dmixed"
}
pcm.capture {
type plug
slave.pcm "array"
}
pcm.dmixed {
type dmix
slave.pcm "hw:0,0"
ipc_key 555555
}
pcm.array {
type dsnoop
slave {
pcm "hw:0,0"
channels 2
}
ipc_key 666666
}