I too seem to be affected by this bug. Ubuntu 10.04 LTS updated as of last week:
pulseaudio                           
1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
gnome-media                          2.30.0-0ubuntu1
libasound2                           1.0.22-0ubuntu6

I have both an SBLive! card and built-in audio in this system - the
inability to adjust left/right balance (and associated lowering of main
volume) via g-v-c applies to both of them.

# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Live [SB Live! Value [CT4670]], device 0: emu10k1 [ADC Capture/Standard 
PCM Playback]
  Subdevices: 31/32
  Subdevice #0: subdevice #0
  ...
  Subdevice #31: subdevice #31
card 0: Live [SB Live! Value [CT4670]], device 2: emu10k1 efx [Multichannel 
Capture/PT Playback]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  ...
  Subdevice #7: subdevice #7
card 0: Live [SB Live! Value [CT4670]], device 3: emu10k1 [Multichannel 
Playback]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Intel [HDA Intel], device 0: ALC889A Analog [ALC889A Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Intel [HDA Intel], device 1: ALC889A Digital [ALC889A Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


Let me know if there is any other specific information I can provide to help 
pinpoint the issue.

-- 
Changing left/right balance in sound-preferences changes the output volume 
slider
https://bugs.launchpad.net/bugs/532095
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