AW: AW: NE570 book from Midwest Analog Products

[Haible Juergen]

	>I suppose using a compressor with no filter cap on it would give an
interesting
	>asymmetrical distortion, and who knows, perhaps a very small cap
would give a 
	>soft 'valve' type distortion? Certainly, there is more to be done
with this 
	>chip yet.

Speaking of a limiter abused as a distortion device:
One on my first FX devices was a "guitar amp" circuit
found in the ELRAD mag, many years ago. It used
two LM13700's, one configured as state variable filter,
and the other one as compressor / expander. The idea
was to use the ompressor CV to control the filter, to get
an envelope follower / moving filter effect. The compressor
was intended to be "clean", but somehow it produced a lot of
distortion. I'm sure I have made some mistake copying the
circuit. I never found the error, the box is long gone into the
wastebin, but I have one piece of music left from this time,
and the effect sound interesting.
The compressor circuit was some NS application, with the
buffer stage of the 13700 used as rectifier, and feeding the
13700's predistortion diodes almost directly, with a low value
resistor and big capacitor in between. Might be interesting to 
experiment in that direction, too.

JH.