pulseaudio

adicionar a linha:
"flat-volumes = no" ao ficheiro /etc/pulse/daemon.conf

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=918463;msg=7

editar o ficheiro /etc/pulse/default.pa e acrescentar no final:

load-module module-echo-cancel source_name=logitechsource source_properties=device.description=LogitechHD
set-default-source logitechsource

para evitar que o módulo ajuste automaticamente o volume:

load-module module-echo-cancel aec_method=webrtc aec_args="analog_gain_control=0 digital_gain_control=1"

https://opensource.com/article/17/1/linux-plays-sound