How to downmix 5.1 to stereo?

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Hello,

I tried the following in my .asoundrc:

pcm.51to20 {
   type route
   slave.pcm default
   slave.channels 6
   ttable.0.0 1      # front left -> left
   ttable.1.1 1      # front right -> right
   ttable.2.0 0.707  # back left -> left, gain 3dB
   ttable.3.1 0.707  # back right -> right, gain 3dB
   ttable.4.0 0.5    # center -> left, gain 6dB
   ttable.4.1 0.5    # center -> right, gain 6dB
   ttable.5.0 0.5    # LFE -> left, gain 6dB
   ttable.5.1 0.5    # LFE -> right, gain 6dB
}

ctl.51to20 {
   type hw
   card 0
}

After logging in again, I don't have a new device "51to20" in "aplay 
-L". How does this "asoundrc" work and how to debug it?

What's the easiest way to make anything, that would go to the back 
speakers or the center speaker, go to my front stereo speakers?

Thanks in advance

Yours

Manuel


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