Hi Joe
It is the Ketron SD2. I have two. One is used with a MidiSport 2x2 to interface with my laptop to produce superior backing tracks.

The second is accessed by a midi cable, to play any of the 5 banks of instruments. http://www.ketronus.com/sd2.html

Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact