I am trying to configure the two, but some harmonies seem a tad off(no not me). I want to make sure the S910 is set up properly for left hand chords.

It calls for global CH 1(usually default). The S910 transmits: L-CH 3 but I assume this is parts and not global.

Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact