I have been working on player pianos since 1976 and have rebuilt
several.  I also built an orchestrion that uses "O" rolls.  I have
the plans for a roll frame if anyone is interested.

I am looking for basic MIDI information so I can learn about it.
I want to build a band organ and another orchestrion but with
solenoids and computer control.  Any suggestions on books, articles
or videos?

Thanks,
Tom Noble