Hi Frank:
Happy New Year, now, talking about the Gem module, as you probably know, Gem has been out of business for a few years now....in fact I remember that was in a Winter NAMM where they gave to all the reps their pink slip. No parts in case you need some.
Anyway, I had some bad luck with GEM, if the OS goes, well, it does not matter if you buy it for a few dollars, plus the time invested, that is the end of it.
I should also remind you that is not to user friendly, that alone, would keep me away, no support from users, or maker....
I would consider other modules like Ketron, SD3, Audya4, Midjay Plus or even a Solton/Ketron Older model like the X4, XD3, Midjay, etc....this models you could buy them from a little UNDER $1,000.00 to around 2K. The older models if you need parts, you have a better chance to find parts, Operating system, styles, etc.
I just check in Ebay and that is what those are going for. But, that is only my opinion.
Good luck in your search.
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mdorantes