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[Scatty]

Originally Posted by CMA Death Adder

Geisha, too, is a Coktel Vision / Tomahawk game. Seems all games that support the InterSound MDO are from Coktel. I guess, because of this, the device would be even more difficult to find due to what I'd think would be a very limited production run. I'll keep my eyes open for one, anyway... always the avid collector, I be.

You're right with that. Here's the list of games which supported it I could find on Mobygames:
Intersound MDO
And a brief mention of it in this article:
SID and DOS