For simplicity and compactness, I chose to control everything from the SD40 so I can use a very slim keyboard controller. I haven't investigated the SD40's midi implementation with controllers. AJ can help us on that.
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Jimmy

Roland E-A7, Ketron SD40, Aiwa Exos-9, Motion Sound, Bose L1 Compact, TC Helicon Perform V, Fender Sonoran, Crown CM311A, Shure Headworn Mics, Korg Microkey61, MobileSheets Pro