# Dmix with 6 channels. pcm.dmix51 { type dmix ipc_key 1024 # must be unique slave { pcm "hw:0,0" # you cannot use a "plug" device here. channels 6 rate 44100 period_time 0 period_size 1024 buffer_size 4096 periods 128 } #channel corrections bindings { 0 0 # from 0 => to 0 1 1 2 4 3 5 4 2 5 3 } } pcm.duplex { type asym playback.pcm "dmix51" capture.pcm "dsnoop" } # Mix the 2 stereo channels to the 6 5.1 channels pcm.51mix { type route slave.pcm "duplex" ttable.0.0 1 ttable.1.1 1 ttable.0.2 1 ttable.1.3 1 ttable.0.4 0.5 ttable.1.4 0.5 ttable.0.5 0.8 ttable.1.5 0.8 } pcm.!default { type plug slave.pcm "51mix" } # Drfault 5.1 input pcm.!surround51 { type copy slave.pcm "duplex" # use our new PCM here } ctl.mixer0 { type hw card 0}