On Fri, 7 Apr 2006, rrooyyccee wrote:

> hi dieter,
> thanks alot for the tip. i'm impressed that you support diy efforts.
> they are still somewhat beyond my technical abilities.
> do you, or do you know of anybody, that could custom make a module for
> me that would invert say 8 - 12 gate signals for under 100 us$

Just a guess, but I don't think you're actually looking to "invert" the
signals so much as "convert" them.

The behavior you described (triggering when trigger is off, not sounding
when trigger is on) isn't an inverted trigger (0v normal, -v trig) but a
classic s-trig (+v normal, 0v trig) like moog synths and many early drum
machines used.

There's a circuit that's been on the web for ages for this:

http://machines.hyperreal.org/manufacturers/Moog/schematics/moog.trigger-convert.jpg

A bunch of these may do the trick for you. Alternately, you could use a
relay circuit for the job, which is what I'm having to do with my dr110...

-Brandon