Hex VC mixer

[Magnus Danielson]

From: "Paul Maddox" <paul.maddox at ndirect.co.uk>
Subject: Re: Hex VC mixer
Date: Mon, 24 Jul 2000 15:53:47 +0100

> Magnus, et al,
> >
> > Oh, did you build it from the directions I gave or?
> >
> 
> sadly no :-)
> It was froma copy of the article some (I forget who, sorry bad memory) sent
> me.

Well, I was just interested to see if I recall it correctly...

> > The two resistors per transistor/gate is required to be of equal
> resistance
> > for optimum linearity.
> >
> 
> thanks, something I shall bear in mind..

What happends otherwise is that the resistance also depends on the applied
voltage, and we wouldn't want that, would we ;)

> >
> > Oh, these 4049UB based VCAs etc seems to catch on ;)
> 
> I shall also be using them for doing the summing/attenuation of the CVs
> going to my Mixer
> and VCA
> 1st - will be doing the mixing of the audio.
> 2nd - will be doing the summing/scaleing of the cutoff CV -
> EG,LFO1,LFO2,VELO,KeyFollow,??? <suggestions?>

External CV input

> 3rd - summing/scaleing the CV for the VCA - EG,LFO1,LFO2,VELO,OSc1,Osc2
> 
> I may consider adding another for controlling the resonance
> (EG/LFO1/LFO2/VELO/OSC1/OSC2)

Another 4049 away ;) You are on the deluxe area here ;)

> So I shall now have 3 of these on each voice card and a lot more flexability
> for routing.

Don't forget to buffer signals and CVs before hitting the 4049. If you take
things locally directly from an output you should be safe, but unknown inputs
should be buffered at least.

Cheers,
Magnus