Permettre d'écouter ce qui arrive depuis l'entrée micro ou ligne : Pour PulseAudio

pactl load-module module-loopback

Charger le module loopback au démarrage

sudo sh -c ' echo "load-module module-loopback" >>  /etc/pulse/default.pa '

Pour ALSA…

sudo modprobe snd_aloop

# create/edit ~/.asoundrc and paste in the following (a bit of alsa black magic):
 
pcm.!default {
  type asym
  playback.pcm "LoopAndReal"
  #capture.pcm "looprec"
  capture.pcm "hw:0,0"
}
 
pcm.looprec {
    type hw
    card "Loopback"
    device 1
    subdevice 0
}
 
pcm.LoopAndReal {
  type plug
  slave.pcm mdev
  route_policy "duplicate"
}
 
pcm.mdev {
  type multi
  slaves.a.pcm pcm.MixReale
  slaves.a.channels 2
  slaves.b.pcm pcm.MixLoopback
  slaves.b.channels 2
  bindings.0.slave a
  bindings.0.channel 0
  bindings.1.slave a
  bindings.1.channel 1
  bindings.2.slave b
  bindings.2.channel 0
  bindings.3.slave b
  bindings.3.channel 1
}
 
pcm.MixReale {
  type dmix
  ipc_key 1024
  slave {
    pcm "hw:0,0"
    rate 48000
    #rate 44100
    periods 128
    period_time 0
    period_size 1024 # must be power of 2
    buffer_size 8192
  }
}
 
pcm.MixLoopback {
  type dmix
  ipc_key 1025
  slave {
    pcm "hw:Loopback,0,0"
    rate 48000
    #rate 44100
    periods 128
    period_time 0
    period_size 1024 # must be power of 2
    buffer_size 8192
  }
}

Ajouter à /etc/modprobe.d/alsa-base.conf

options snd-aloop index=-2

Error: audio: /dev/dsp: No such file or directory

If the audio mixer application is reporting that no mixer is available, or gives an error:

audio: /dev/dsp: No such file or directory

It is necessary to load the snd-pcm-oss module.

padsp executable_name > /dev/dsp

$alsactl store