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.

Isaiah 53:5
But He was wounded for our transgressions, He was bruised for our iniquities: the chastisement of our peace was upon him; and with His stripes we are healed.

Korg PA1000, Roland E-A7, Ketron Midjay Pro