I was wondering if there are any MIDI recording systems that
accept dry contacts information.  I wanted to build a pneumatic
88-note roll scanning device (if that's the right term).  [Better
is "roll reader".  -- Robbie]

I have the spool box and the pneumatically operated switches (all
from a pipe organ player).  What I don't have is a way to connect
those switches to a MIDI device for recording the dry contact impulses.

Thanks for any help. If this project comes to fruition, I'll post
all of my collection on MMD.  (Well, any that I would not get in
trouble for, anyway.)

Tim L'amoureux
timlamour@aol.com.geentroep [delete ".geentroep" to reply]

 [ See the MIDI encoders at http://midiboutique.com/MIDI-Encoders 
 [ "Dry" switch contacts work fine when the load is 12-volt organ
 [ magnet valve coils that create a nice spark at the switch contacts.
 [
 [ Without the sparking, however, the contacts at low voltage become
 [ contaminated and unreliable -- think of the key contact problems
 [ in the electronic organs of the 1960s.  I recommend switching at
 [ least 48 volts at a few milliamperes so that the contacts stay clean.
 [
 [ -- Robbie