j-Omega Electronics, in England, makes a parallel-to-MIDI encoder
board that accepts 128 key closures and outputs MIDI on one channel.
The key closures or relay closures need to be 5 VDC.  Visit

  http://www.j-omega.co.uk/ 

Bill Klinger
Flippin, Arkansas

 [ For example,  http://www.j-omega.co.uk/PTM/ptm.shtml 
 [ -- Robbie