Dear Craig,

The arrangements I've heard by George should sound mighty good on 
the big orchestrion you're building.  Since you are planning to use 
electric valves anyway, may I suggest that you defer construction of 
the complicated multiplexing system, and get everything else working 
using a MIDI control system?  It's quite possible your customer (and 
you!) will enjoy the convenience of MIDI files.

Digest member Mike Ames <ames@foxtail.com> has successfully 
equipped Mills Violana machines for MIDI, and similar electronics 
could easily be applied to your "monster Coinola!"

Best wishes, Robbie Rhodes