The mute button worked without any action on my part, but the volume did not. Now when I boot, the headset is always the second device. Create new file /etc/modprobe.d/usb-headset with # Set usb headset as second device The assignment of device numbers can be controlled using a module parameter. If I booted with the headset plugged in, the headset device drivers would load first,making the headset the first device. Plugging in the headset now would make it the second device (/dev/dsp1). If I booted the PC without the headset, my main sound card would naturally be the first device(/dev/dsp). I want the headset to be the second device This may have started working at the same time I downloaded new firmware to the device, I just don't know. I still don't know what changed, but at some point the headset could be controlled from alsamixer. When I first tried to use the headset, It worked fine, but I couldn't control the volume or mute the mic no matter what I tried. The model I have is the DSP 300, although I expect that these instructions will work for other models also. I also had problems if the headset was plugged in when I booted the PC. While the headset itself worked straight off, the volume control did not. The headset has a control with volume and mute buttons. I got a Plantronics USB headset to use for Skype. How To - Get the volume control working on the Plantronics USB headset

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Plantronics audio driver