USBAudio.sys source code

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Hi,

I need to develop a USB audio class 2.0 driver and would like to base it on
the USBAudio.sys audio class 1.0 driver. Is it possible to get the source
code to USBAudio.sys in order to expedite this process?

If this is not possible, does anyone have recommendations for how to go
about this without having to write everything from scratch? For example,
what would be the best way to write an audio device driver that is compatible
with vista/7 or xp/vista/7?

Thanks a lot

Philip
.

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