From dougsyolists@aol.com Wed Mar 27 06:38:44 2002
Subject:Re: controller that simulates the half moon

In a message dated 03/27/2002 4:25:06 AM Eastern Standard Time,
larrydurantus@yahoo.com writes:

<< Is there a controller out there that simulates the half moon Leslie switch
for the Pro-3T instead of the footswitch...?

Has anyone tried to construct one?

How well does the footswitch work for the pro 3 ? >>

If you're at the console of a "real Hammond" (A-105 here - C-3+speakers),
seated, the footswitch isn't a good choice unless you only change it
infrequently or put it where you can work it by hand.

I constructed an "under the edge" switch box - two SPST switches, wired to a
20-foot stereo headphone extension cable that I cut the jack end off of. It
works for me, it has a third switch that toggles a load resistor or the
speakers in my console. It's close to where a set of half-moons would be
located.

If you only want slow-fast, you could short the slow switch wires and use a
SPST switch to open or close the fast switch. The price for H-S's new
half-moon fast-slow switch is $89 from VintageHammond (see
http://vintageorgans.com/acc/lessw.asp and
http://vintageorgans.com/cart/Leslieparts.htm ) and I'm sure that can be
fudged some to work with M-S.

The wiring for the foot switch is at:
http://www.motion-sound.com/Tech%20Scans/PRO-3(T)%20Footswitch%20Wiring.jpg
(join those two parts together to see it).

If I remember right, the fast switch is open for fast and closed for slow,
where the slow/stop switch is closed for slow and open for stop - ie they're
wired backwards of each other. Also, the fast switch overrides the other
switch if it's off, it's fast, if it's on, then "use what the other switch
says" This makes sense if you assume "no pedal plugged in = fast".

The down-side of this is that a SPDT center-off switch wouldn't work for
slow-off-fast. A DPDT switch could be used to wire off-fast-slow or
slow-fast-off (close fast and open slow for off, both open for fast, close
fast and slow for slow), but it wouldn't match the labels on a Leslie switch.

You could probably also use a SPDT center-off switch if you wanted to do some
fancy things with relays to invert the fast switch.

Doug