If you've had any experience with Data Translation, How hard is it to get their A to D converters going through USB on OS X?
Where should I start?
<http://www.datx.com/mac/welcome.html> covers only the very old DT9800, and OS 9, not OS X. It doesn't seem to have been touched since the year 2000, and a quick search with Google, and of http://sourceforge.net turned up nothing useful (only Linux driver source code for a video frame grabber board from 2001.)
