I read with interest Bill Mote's posting.  I am nearing the end of
the process of building pipes for the air calliope according to David
Kerr's plans.  I have yet to build the air chest to put all the pipes
on, and also am trying to decide how to valve and control the valves.

From what I've researched on the Internet, I'm leaning toward software
and electronics that James Anderton posted.  It will send MIDI files
through the parallel printer port of my laptop and control solenoids
attached to the valves.  I'd go with R. Lang's plans, except it requires
a MIDI output, which I don't have on a laptop.  James Anderton's plan
will also let you put up to two hours on an EPROM, so you don't even
need a computer.  The only restriction is that the drain on the circuit
can not exceed 1/2 ampere.

I'm still stuck on deciding about valves and solenoids.  Money is a
factor here: I'm hoping to integrate this into a unit about sound with
my physics class, and I have to make all the purchases out of my
pocket.  Any suggestions would be appreciated.

I'm curious, Bill, how you built your pipes.  Are you working off of
David Kerr's plans too?  What are your pipes made of?  We are trying
PVC and CPVC, as per David Kerr, again because of the cost.

Larry Claus