Paul,  I have a MIDI Decoder unit for 64 notes with magnet drivers for
coils of 90 ohms or more, as a single board unit.  I also have a
3-board unit for coils of less than 90 ohms, or coil loads or several
amperes per coil.  Mr. Robbie Rhodes has one of my high current driver
boards for test purposes; some day maybe he will publish his results.

Vern Jones - Sound Research
Newcastle, CA
http://www.foothill.net/~soundres/

 [ Ah, the circuit card performs admirably.  But until I acquire and
 [ install the high-current components for testing I have no results
 [ to report.  Too many projects!  :-(   -- Robbie