COMPUTER/asoundrc-example at master · SacredData/COMPUTER · GitHub

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# ------------------------------------------------------
# hardware 0,0 : used for ALSA playback
pcm.loophw00 {
  type hw
  card Loopback
  device 0
  subdevice 0
  format S32_LE
  rate 96000      # Use 44100 or 48000 unless you have a pro sound card
}

# ------------------------------------------------------
# playback PCM device: using loopback subdevice 0,0
# Don't use a buffer size that is too small. Some apps
# won't like it and it will sound crappy

pcm.amix {
  type dmix
  ipc_key 219345
  slave {
    pcm loophw00
    period_size 4096
    periods 2
  }
}

# ------------------------------------------------------
# software volume
pcm.asoftvol {
  type softvol
  slave.pcm "amix"

  control { name PCM }

  min_dB -51.0
  max_dB   0.0
}

# ------------------------------------------------------
# for jack alsa_in: looped-back signal at other ends
pcm.cloop {
  type hw
  card Loopback
  device 1
  subdevice 0
  format S32_LE
  rate 96000
}

# ======================================================
# ------------------------------------------------------
# hardware 0,1 : used for ALSA capture
pcm.loophw01 {
  type hw
  card Loopback
  device 0
  subdevice 1
  format S32_LE
  rate 96000
}

# ------------------------------------------------------
# for jack alsa_out: looped-back signal at other end
pcm.ploop {
  type hw
  card Loopback
  device 1
  subdevice 1
  format S32_LE
  rate 96000
}

# ======================================================
# ------------------------------------------------------
# duplex device combining our PCM devices defined above
pcm.aduplex {
  type asym
  playback.pcm "asoftvol"
  capture.pcm "loophw01"
}

# ------------------------------------------------------
# default device
#pcm.!default {
pcm.card0 {
  type plug
  slave.pcm aduplex

  hint {
       show on
       description "Duplex Loopback"
  }
}