audio on a USB PORT

[Howard Traxler]

Does anyone know how many conductors are terminated in the various types of 
USB connectors?  Is audio actually carried on any of these conductors? 
Ideally it would be 6 conductors for audio: two each for stereo output, high 
level input, and low level input.  However, it seems that anything I've read 
points to serial data only, and is only a port through which one could 
connect an external audio device.  I have a stereo headset with a mic that 
connects to a USB port.  I wonder what kind of data is being passed up that 
wire?

Wonder if anyone has any thoughts (or, perhaps, some real knowledge).
Thanks.
Howard 


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