permet de 'convertir' une sortie alsa en jack sans libio

~/.asoundrc ou /etc/asound.conf

# convert alsa API over jack API
# use it with 
# % aplay foo.wav
# use this as default
pcm.!default {
    type plug
    slave { pcm "jack" }
}
# pcm type jack
pcm.jack {
    type jack
    playback_ports {
        0 alsa_pcm:playback_1
        1 alsa_pcm:playback_2
        }
    capture_ports {
        0 alsa_pcm:capture_1
        1 alsa_pcm:capture_2
        }
}

Ajout a chaud d'entrées sorties son supplémentaire marche nickel sur la raspberry

alsa_out / alsa_in -j “nom de la sortie” -d device -q qualité -c channel

# ajout en sortie 
alsa_out -j "System Speakers" -d hw:1 -q 1 2>&1 1> /dev/null &
# ajout en entree
alsa_in -j "micro2" -d hw:1 -q 1 2>&1 1> /dev/null &

• https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_AlsaInOut
• http://www.penguinproducer.com/Blog/2011/11/using-multiple-devices-with-jack/

• https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_NetJack2

• apt install zita-njbridge

• http://www.penguinproducer.com/Blog/2011/11/voice-effects/