Ed,
Just noticed it's a Yamaha
You need the hostdriver from Yamaha!
You can download this driver at;
http://www.yamaha.com/ycaservice/Driver2.htm
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76