SergeModular

> I just received my GP-10S brochure from Ray. The patch panel is very

simlar

> to the GP-6 with 4 summer-integrators, 4 summing mixers, 2 multipliers,
> DC/ground patch points, and potentiometer patch points. It also has a
> "trunk line" which I'm guessing might be a multiple.

> The right side of the panel is different. There are no digital voltmeter

or

> run mode controls, just 12 knobs/potentiometers, 8 of which are configured
> as voltage dividers and 4 which are connected to DC voltages with just the
> variable leg connected to the patch panel for setting "Initial

Conditions",

> or DC bias in synthesizer language.

The digital voltmeter is no greal loss (you can buy on for £10 if you
need one), but the run mode control stuff might be useful if it could
be friven by a trigger or gate. I see the analog computer as a
control gererator as much as an audio processor, so gate control
of the reset/run/hold functions looks like an essential function. I know
that gates and triggers can be input directly to the individual sections,
but overall control seens like a serious omission.

> The built in options to the GP-10S are pretty limited, just more accurate
> multipliers or an integrating capacitor group that gives greater time
> scales. However, there are also banana plug modules that look

interesting,

> such as comparator feedback elements, absolute value (rectifier) module,
> even a VCO, though for the price ($95) I would guess it is a simple
> Hertz/octave type.

Most of this is fairly basic stuff. If anyone's interested, I have a DIY
analogue computer article I can scan. It's probably not as precise, but
it shouldn't cost more than 1/10th the price of the GP10S. You lose a
few features (and gain a reset/run/hold switch), but it's a cheap way
to find out if you want to spend $950 on a real one. I'll scan it if
there's
a lot of interest...

> I have emailed Ray Speiss to ask if it's okay for me to scan and post this
> to the Yahoo files site. I'll post a message to the group as soon as I

find

> out.

Thanks. Read and very interesting.



Steve Ridley

(who hasn't used an analogue computer for 20 years and wishes he
could remember a bit more).