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

For the Father shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil. Ecclesiastes 12:14

Korg PA1000, Ketron Midjay Pro, vArranger