I've been working to build my home organ since the mid 1980's. Originally an Estey Grand organ (reed organ), through manufactured backfalls, the instrument plays a number of m-audio keyboards and others... Along with the reed organ, it plays 3 Hauptwerk organs,1 GrandOrgue organ, 2 Yamaha keyboards, and one Ahlborn Galanti Organ Module. Manual 1 organ can also mechanically couple to manual 2 organ. The pedals mechanically couple to Man 1 and 2. I can load classical or theatre organ. It's a lot of fun. The computers/keyboards and Ahlborn Galanti outputs go into a Mackie sound desk and out through large stage speakers. and the reed organ still works too!