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Subject: Re: MOTM Pre-amp

From: thudson@...
Date: 1999-09-08

JWBarlow@... wrote:

> Basically I like to have a clean signal on my guitar and three (or more)
> kinds of distortion available:
> 1) Crunch -- a basic rhythm sound like you get from a severely overdriven
> Marshall or Fender (output transformer saturated -- can't small transformers
> be overdriven by smaller voltage levels to achieve similar sounds at lower
> levels?).
> 2) Lead -- a very compressed stinging sound. Really just a more intense
> version of crunch.
> 3) Fuzz -- a caricature of those sixties guitar sounds found on the Nuggets
> albums (when was the last time you guys heard "Psychotic Reaction"?).
> 3b) Octave Fuzz -- I put a foot switch in my Foxx to allow it to do this. You
> can get a great Fripp sound like this (Belew still uses a Foxx).

Actually, last night I realized it might be simpler to take two or four
of the most unique distortion circuits and vc pan between them, rather than
try any trickery with reconfiguring diodes. Buffer the input and send it
to every distortion input, and then use vc to select the output. Perhaps
vactrols could be used to keep the parts count down, but most of these
fuzz circuits use very few parts. I would suggest placing devices w/
even order harmonics opposite devices w/ heavy odd order harmonics:

big muff (fuzz) Foxx
+------------------------+ (octave fuzz)
| ^ |
| vc1 < vc2 > |
| v |
| |
+------------------------+
Tube Screamer fuzz face
(crunch) (lead)

So now with two VCs (or a joy stick) I can smoothly select between different
sounds. Of course, the first thing I would want to use to control such
a device is quadrature LFO (another MOTM I would love), to spin around
the various sounds. Hmm, how about random out from two MOTM-100s....

Of course, if Paul is looking for simple 1u modules this could be split
up into several modules. The 2xVC select of four inputs is similar to
J.H.'s morphing programmer.

Thomas