pcm.dmixed {
        type asym
        playback.pcm {
                type dmix
                ipc_key 5678293
                ipc_perm 0660
                ipc_gid audio
                slave {
                        channels 6
                        pcm {
                                format S16_LE
                                rate 48000
                                type hw
                                card 0
                                device 0
                                subdevice 0
                        }
                        period_size 1024
                        buffer_size 8192
                }
 
                bindings {
                        0 0
                        1 1
                        2 2
                        3 3
                        4 4
                        5 5
                }
        }
}
 
pcm.upmix21 {
    type route
    slave.pcm dmixed
    ttable.0.0 1
    ttable.1.1 1
    ttable.0.5 0.5
    ttable.1.5 0.5
    ttable.5.5 1
}
 
pcm.!default upmix21