pcm.!default { type hw card 0 device 3 } #ctl.!default hdmiout pcm.optically { type hw card 0 device 1 } ctl.optically { type hw card 0 device 1 } pcm.hdmiout { type hw card 0 device 3 } ctl.hdmiout { type hw card 0 device 3 } pcm.multi { type multi slaves.a.pcm "hdmiout" slaves.a.channels 2 slaves.b.pcm "optically" slaves.b.channels 2 bindings.0.slave a bindings.0.channel 0 bindings.1.slave a bindings.1.channel 1 bindings.2.slave b bindings.2.channel 0 bindings.3.slave b bindings.3.channel 1 } ctl.multi { type hw card 0 }