Jim Thompson wrote:

Are you forgetting I have a headset attached? I want the switch
equivalent of unplugging the headset.

OK, so you need to make/break audio and not USB? That may be a hard
nut to crack. Newer PCs seem to sense when an audio connection changes.
One way of doing that is to use a phone jack similar to symbol D in
this schematic:

http://upload.wikimedia.org/wikipedi...ck_symbols.png

The tip breaks/makes a switch as the plug is inserted/removed. When
plug is removed the tip signal lines(s) get(s) connected to an unknown
"black box" circuit.

--
Don Kuenz