Hi, > But I just realized that it's 'only' 5.1, not 7.1 ... I did not find 5.1 or 7.1 or mulctichannel with snd_bcm2835.ko with module_blacklist=vc4 on my RPi4B... I only found "stereo" in snd_bcm2835.ko with pacmd list-sinks. Best regards, Ryutaroh