I'm experiencing just the same problems while using Logitech V20 USB speakers.
lsusb gives the following line:
Bus 004 Device 003: ID 046d:0a04 Logitech, Inc.
Please tell me what information I can provide to help locating the bug, since 
I'm not familiar with this process. Thank you.

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USB sound left volume controll bug
https://bugs.launchpad.net/bugs/153264
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