AW: AW: VCO-1C

[Haible Juergen]

	>Polysix also uses such VCA (with two transistors) and it sounds
rather
	>noisy to me (even with effect section turned off),but IMO it's not
	>so bad in final mix.

Same for the Mono/Poly. It's grat for all kind of Lead sounds,
and you won't notice the noise. But for low bass sounds, or
dark pad sounds, a good VCA makes a great difference.
Not just in theory - I made a direct A / B comparison with
two different VCAs in the same synth.
I've sold it some years ago, unfortunately.

> > BTW, there's a 1-transistor and a 2-transistor version of this Korg-VCA,
> > and they have very different transfer courves when overdriven.
> > (1-transistor version is only clipping one side of the signal)
> 
> 
	>as in MS20 (old version with korg vcf chip uses 1,and ota version
vcf
	>uses 2 
	>transistors in VCA). But it sounds so great to me (ota version)... 

The OTA version is one thing that's high on my list for things
to build.
I have the old version (with two Korg-35 modules) as a standalone
module (Part of JH-3 Modular), *without* the VCA, and it sounds
very similar to the MS-20 I used to own. So my guess is most
of the MS-20 overdrive sound is due to the filter, and not the VCA.
(But I have no real A / B test in that case. Sold my MS-20 before
I finished the JH-3 Module, if memory serves ...)
BTW, this standalone filter is noisy as hell, too, so in the MS-20
a "better" VCA would be overkill. The SSM2044 filter synths
from Korg are a different thing. Imagine the bass power of a Trident
MKII, if it wasn't for the noise !

JH.