Thank you! that works : mixerctl -f /dev/mixer1 -w fea11-i1-master=220 , imic usb audio is running, mpg123 plays all my files. :) > Try mixerctl -f /dev/mixer1, this is output for your _first_ > audio device. > > IIRC iMic master output appears as 'fea11-i4-master' mixer control. > > Jaromir