He, I'm running Amix on an A3k UX too. Here is a link how to create the install tape from Amiga OS (ehhhh 3.9 not 4 or 5 :-) )
http://www.amiga.org/forums/showthread.php?t=19629 I'm trying to create a gfx driver for a cv64 using the NetBSD code for the same card, but this is a long term project ... Running on WinUAE will not work I think. Amix needs a working MMU for a 030 processor. My A3k box is running with an Phase 5 Blizzard 4030 (68030 at 50 MHz). This is the maximum available speed.