Does ST provide USB audio driver for Window XP/Vista or Does ST use the standard protocols and no proprietary drivers are required? From the demo code downloaded from the website, I can find the drivers of mass storage device and virtual com port. But the demo code for the audio speaker doesn't need audio driver in PC. If I want to output digital audio to PC via USB, do I need to implement the proprietary audio driver for it? Thanks. Best regards, Albert.. :)