I can confirm the bug on my Gutsy, 2.6.22-14-generic #1 SMP, with HP Pavillion 
dv5000 / Intel sound (same as darth_schmoo):
I get no effects if I change (up/down/mute) the master channel volume (with KDE 
KMix, or command-line alsamixer, or with the volume keys on the keyboard). 
instead, PCM channel does work fine (except at loud volume levels: as on 
Feisty, the sound becomes lightly distorted, while with winxp I hear it clean - 
but this is another question). 

# tail -n1 /proc/asound/oss/sndstat
0: Conexant CX20551 (Waikiki)

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Muting Master channel doesn't mute sound
https://bugs.launchpad.net/bugs/93600
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