Audio with Motu 828 Ultralite MK3, error when trying to play a wave file

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I’ve had a lot of trouble with MOTU on Windows myself. In my experience it’s infinitely easier to work with on OSX, though in theory it should all be possible through Windows. I don’t have any advice per se, but having been in Windows MOTU hell, I just wanted to wish you luck. It seems like you’re having a different issues than me, but here is the old thread I started. Maybe it will spark something even though it’s a separate problem. Outputting to multiple audio devices