I need to preface this by very briefly discribing how an organ works
Organs usually have at least 2 keyboards (manuals) 61 keys each and a 32 note pedal board a total of 154 keys and then however many stops to control different ranks of pipes for the pedals and manuals.
61 pipes per rank so an 8' principal would have 12 8' 4' 2' 1' and 13 1/2' pipes adding to 61
Would it be possible to get all of this information into a single Pi and then get it sent to a second pi in the pipe loft connected to relays to turn on and off the pipes? I assume that the manuals and pedals could be done through a matrix. Traditionally organs use a diode matrix system with a 64 pair cable to the chest matrix board but recent much more expensive iterations use digital controllers with a single cat5 linking console encoder to chest decode. I want to build the latter of the two options as the real systems are incredibly expensive.
The new systems being Peterson ICS-4000 or the Matters organ control system.