Software-Frquenzweiche für 5.1

pcm.snd_card {
        type hw
        card 0
        device 0
}


ctl.snd_card {
        type hw
        card 0
        device 0
}


pcm.dmixer {
    type dmix
    ipc_key 1024
    ipc_perm 0666
    slave.pcm "snd_card"
    slave {
        period_time 0
        period_size 1024
        buffer_size 4096
        rate 44100
        channels 6
    }
    bindings {
        0 0
        1 1
        2 2
        3 3
        4 4
        5 5
    }
}




pcm.upmix20to51 {
    type plug
    slave.pcm lowpass_21to21
    slave.channels 3
    ttable {
        0.0     1       # left channel
        1.1     1       # right channel
        0.2     0.5     # mix left and right ...
        1.2     0.5     # ... channel for subwoofer
    }
}


pcm.!default {
type route 
slave.pcm upmix20to51
ttable.0.0 1
ttable.1.1 1
}






pcm.lowpass_21to21 {
    type ladspa
    slave.pcm upmix_21to51
    path "/usr/lib/ladspa"
    channels 3
    plugins {
 0 {
            id 1098 # Identity (Audio) (1098/identity_audio)
            policy duplicate
            input.bindings.0 "Input";
            output.bindings.0 "Output";
        }
1 {
            id 1672 # 4 Pole Low-Pass Filter with Resonance (FCRCIA) (1672/lp4pole_fcrcia_oa)
            policy none
            input.bindings.2 "Input";
            output.bindings.2 "Output";
            input {
                controls [ 300 2 ]
            }
        }




    }
}


pcm.upmix_21to51 {
    type plug
    slave.pcm dmixer
    slave.channels 6
    ttable {
        0.0     1       # front left
        1.1     1       # front right
        0.2     1       # rear left
        1.3     1       # rear right
        0.4     0.5     # center
        1.4     0.5     # center
        2.5     1       # subwoofer
    }
}