Hi, Tanks for the advice and example. Unable to find the channels numbering, I tried with the assumption that inputs are 0-15, playback 16-31 and ouptuts 0-15, but it doesn't work (there are seemingly 16 channels of each type). Checking with the graphical HDSPmixer doesn't help as it loads it's own setup when starting, so it does probably erase my "manual" setup... Does anyone know the HDSPe AES channels numbering ? Thks Francois Le 27/11/2016 à 13:00, linux-audio-user-request(a)lists.linuxaudio.org a écrit :