So it must be a GEM product...maybe a module, or a synthesizer?

I've listened again, and I don't recognize any familiar characteristics of the sound...that's why I thought it might be a GEM....or even a Mediastation(wild guess)
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.