Comment 2 for bug 158590

I am having the same issue stated above by both people. The volume adjustment is not working properly with my USB headset. If I try to adjust the volume with the Volume Applet (with my mouse) it does the same thing, so it's not just the buttons on my headset. I found that I don't actually have to close the volume control applet (although it is pretty useless) and the alsamixer still fixes the problem.

My system:
Clean install Ubuntu 7.10
Plantronics DSP 500 (now called GAMECONPRO 1)
http://www.newegg.com/Product/Product.aspx?Item=N82E16826106070