can't modify Playback Channel Map

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hello all,

i'm having a problem with sound volume being too low.
i *think* it's due to the levels of my channel map being
too low.....


numid=26,iface=PCM,name='Playback Channel Map'
   ; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
   : values=3,4
   |     | chmap-fixed=FL,FR



but i can't modify this....

  > amixer cset numid=26 4,4
  amixer: Control default element write error: Operation not permitted


my alsa-info...

http://www.alsa-project.org/db/?f=3ba6278df3c6c4abe5196ad37f8015de7223ca8e


thanks,
sam




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