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.
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