Same issue here with my Terratec DMX6fire (icq1712).

To make one master-fader out of the two DAC-outputs (left and right) I
enabled software-mixing in addition to the softvol-plugin:

#/etc/asound.conf start:
pcm.ice1712 { 
  type hw 
  card 0 
  } 
ctl.ice1712 { 
  type hw 
  card 0 
  } 
pcm.!default {
  type plug
  slave.pcm "softvol"
  }
# softvol - Volume Control
pcm.softvol {
    type softvol
    slave.pcm "dmixer"
    control {
        name "PCM Volume"
    card 0
    }
}
# dmixer:
pcm.dmixer {
  type dmix
  ipc_key 1024
  slave {
  pcm "hw:0,0"
  period_time 0
  period_size 1024 
  buffer_size 4096 
  rate 44100
  format S32_LE
  }
  bindings {
  0 0
  1 1
  }
  }

But thats not the solution to the broken gnome-mixer. "alsamixer" works
fine BTW.

-- 
gnome-mixer-applet shows wrong volume slider controls for my ice1712 based 
soundcard
https://launchpad.net/bugs/57419

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