Using compressor + limiter with 6 channel sounds

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Dear list,
This is my .asoundrc, and the pair compressor + limiter works fine for
stereo input:

----------- >8
pcm.ladcomp_compressor {
  type ladspa
  slave.pcm "ladcomp_limiter";
  path "/usr/lib/ladspa";
  plugins [{
          label dysonCompress
          input {
              #peak limit, release time, fast ratio, ratio
              controls [0 1 0.5 0.99]  }
      }]
}

pcm.ladcomp_limiter {
  type ladspa
  slave.pcm "plughw:Audigy2";
  path "/usr/lib/ladspa";
  plugins [{
          label fastLookaheadLimiter
          input {
           #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
time (s) 0.01 -> 2
           controls [ 20 -1 0.8  ]  }
      }]
}
8< -----------

Unfortunately, it does not work for 6 channels.

I.e., this one works fine (I setup my system to use a certain PCM
via environment variable):
$ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 2 -t wav -l 5

This one does not and you hear only the left and right channels.
$ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 6 -t wav -l 5

Of course the hardware is wired correctly and this one works as expected:
$ ALSAPCM='pcm.surround51' speaker-test -c 6 -t wav -l 5


Since normally you have to select surround51 manually I thought that the
problem could be in the output pcm, and I rewrote like this. But it is the same:

----------- >8
#[...] analogous 51 compressor omitted

pcm.plug51 {
  type plug
  slave.pcm "surround51"
  slave.channels 6
}

pcm.ladcomp_limiter51 {
  type ladspa
  slave.pcm "plug51"
  path "/usr/lib/ladspa"
  plugins [{
          label fastLookaheadLimiter
          input {
           #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
time (s) 0.01 -> 2
           controls [ 20 -1 0.8  ]  }
      }]
}
8< -----------

Is there a way? Any insight?

Yours faithfully,
Paolo

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