To compile the firmware for the USBDUX,USBDUXfast and USBDUXsigma
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Download the as31 from:

http://www.berndporr.me.uk/as31/

(this is a patched version of as31 which supports an
include directive).

Install it in this directory.

Then run "make -f Makefile_dux".

Feedback:
BerndPorr@f2s.com