I can use just the SK1 as I said, with the only disadvantage being that I have to layer the lead if I configure the SK1 to include RH voice of the module, or, turn down the volume of either. I can play with either keyboard or both, no problem.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact