He’s just telling about it. Don’t add nonsense.

I wondered about that, and didn't realize that the thickness of the wood made a difference, and always have figured length was all.

Simon and Garfunkel are amazing!

I dont know, I love the clacking of the solenoids opening and closing as it changes notes, like a mini organ player is keeping time. I think it just adds a cool effect. though this does show that you literally can't please everyone ;)

Totally - old tracker organs often clack along with the playing, but it can get tiring if overdone... (I love old tracker organs)

He's a doer, my kind of guy.

Link to blog/video of your organ?

An excellent Suggestion

I expect he considered how to implement the system before doing it this way. The cable management is all about preference(and just because he is showing it off does not mean the project is finished, you know) and he probably knows how much current his actuators need and so can select suitable wiring. As for the controller setup, well, from what I understood he is using MIDI between the Raspberry Pi and the Arduino, which means that technically the Arduino is the controller for the instrument(similarly to how a MIDI synth or other equipment will have it's own controller that decodes and executes the commands separately from the device that issues the commands) while the Raspberry Pi is acting as a more general purpose computer where he can play MIDI files and have a user interface. I wouldn't be surprised if he is considering adding more racks of pipes or other instruments later, and so wanted the flexibility of a MIDI system.

Pshhhhhhh. "More refined". To me it looks like that organ is working LIKKA BOSS.

It can't.

Uh what else would it be playing? Recorded notes are usually stored in midi files. It would be much cooler if there was an actual keyboard connected to it, someone playing it.