AW: Japanese and Korg35

[Martin Czech]

> VCO into the CV input gives to usual audio rate FM effects known from the
> Minimoog and the Prophet 5. With relatively low modulation strength, that
> is !
> But with increased modulation depth, the simple 3-transistor-filter is
> capable of
> beatiful FM type sounds that go far beyond the general Minimoog stuff.
> Beautiful
> is the only word to describe it. That's why I probably leave the circuit in
> it's
> "unlimited" version.


To my ears, some of the very special MS20 sounds on the CD sound more like
AM, or better intermodulation, signal and control signal intermodulate at
the internal nonlinearities (of course only audible for high modulation
speed). Also for two signal input signals.

> I still have one big question. When Korg already had Diode Ring filters
> (in the MS-50 for sure, and probably in some of the Traveller filters
> as well), why would the go back to an asymmetrical filter for the
> custom chip they were going to use in so many products ??
> The diode ring should have much less CV feedthru even with
> unselected diodes, wouldn't it ?
> 

Yeah, and further, if they were allready going cheap low cost (vca),
why would they make a special IC or module at all? Makes no sense to
me, just solder in a couple of trannies etc. would have been cheaper,
and faster, too.

I think japanese manufacturers wouldn't do something like that.

The japanese web site gives a slight hint, but only a hint, no evidence
that the proposed circuit is that of a Korg35. We still simply don't know.

I don't even have a MS20 ;->.

Juergen, if I understand correctly, you have two Korg35 things ?

May be you could take a scope probe and have a look at all pins?

You certainly know what to do...

I think, this might bring some light into darkness....


m.c.