Here's my rough improvisation with Keith McMillen 12STEP foot controller assigned to the Organ's pedal-board.
12STEP is a road-proof, brilliantly back-lit MIDI keyboard foot controller. Designed to be ultra-portable and fit in a backpack or gig bag!
Check it out at: https://www.keithmcmillen.com/products/12-step/
Organ sound by GSi VB3 (http://www.genuinesoundware.com). The Z-Key 61 and XKey 37 keyboard contollers are provided by CME Pro (http://www.cme-pro.com).