The author of MPegDec (?) used to hang around here back in the beginning. IIRC, he was working on a version to use the DSP on the SA II and I wanted to use it for the DuoBoomBoxDock™ hack.
The acceleration scheme never worked out though. :-/

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What a cool idea.

I got it too, now just I need to find the SA II to try it on my IIfx.

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There is another copy of Turbosynth available if you search for that name in youtube and click on the link in the description section. There are many more files such as demos files. The unfortunate part is that it looks like the maker of the .RAR file lost the resource fork and creator info for the files. I was able to restore the demo files by correcting the creator and type info with a batch utility in OS X, but not the waveforms-- at least not yet.