Using the SD40/SD90 with a MIDI controller like a guitar, keyboard, guitar, or accordion, you can map the buttons to the Start/Stop, Fill in, Break, Arranger A-D, Ending, Voice, and Registrations buttons on the SD40/SD90. This eliminates reaching out to the module. You can move it aside to save space and keep on playing while changing sounds, styles, and more as you always have before. Ketron Dealer, IMMusic, demonstrates here.