[sdiy] ... Simulating a Moog

[Harry Bissell Jr]

--- john mahoney <jmahoney at gate.net> wrote:

> Julian,
> Uh oh, this is like discussing religion and politics
> at a party! ;-)

No... discussing religion and politics at a bar
brawl...

Perhaps the actual Moog synthesizer is just an analog
representation of a more perfect, archetypal synth
that
exists in another universe. I suppose THEY say that it
is somewhat lacking in its interpretation as well :^P

It is possible to spice model such a beast. The
biggest
problem would be to validate the model... you'd need
to
compare to the 'real deal' for that.

Spice is very much NOT real time. You might record a
simulation and make it into a .wav file. Someone on
this
list mentioned doing that once (sorry I forget who...)

The BIGGEST problem will be the modeling of PARASITIC
circuit elements... the stray inductance, resistance,
and capacitance that real components have, and most
models lack. These will slow the simulation down by
orders of magnitude, and you will not be able to
predict what parasitics color the sound in
identifiable ways, and which ones... er.. slow the
simulation down by orders of magnitude (uselessly).

Another problem is to simulate mutual coupling (if it
exists)... even harder to do than simulating
parasitics.

I use spice for synth circuits all the time. I have
not
listened to any of them. I use it to narrow down a
range
of components and operating parameters, then build it.

"If you build it - they will come"

H^) harry (well, at least they will breathe hard...)