I have a similar problem.
Since when I upgraded to kubuntu 7.10, my keyboard volume key only controls the 
"main" channel.  The problem is, that the main channel does not affect my rear 
speakers (I have 4.1 setup). Before I solved this problem by setting in kmix 
PCM as the main channel. Now this does not work anymore.
There is a similar bug here: 
https://bugs.launchpad.net/ubuntu/+source/kdemultimedia/+bug/106926

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sound volume keyboard shortcut keys don't change sound volume
https://bugs.launchpad.net/bugs/154943
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