[sdiy] CGS Analog Logic queries

[David Brown]

I use mine mostly for audio.  Occasionally I will use it for control 
voltages.  The example you describe (sine and triangle) brightens up 
the audio.  I don't really think about it - I just plug signals into 
it and leave it if it sounds better.

http://modularsynthesis.com/modules/DJB-009/djb009.htm

Dave

At 06:50 PM 1/11/2010, David G. Dixon wrote:
>Ian, it's funny, but I did more or less exactly the same thing when faced
>with the XOR ring-mod part of the CGS Digital Noise circuit.  I wanted to
>see what would happen when I put audio signals through it, so I simulated it
>in Multisim.  I didn't find the outcome that interesting, personally.
>
>However, the CGS Analog Logic circuit takes several incoming voltage sources
>and gives either the minimum or the maximum voltage.  Hence, if you have a
>sine and a sawtooth coming in, the AND function will give the lower lobes of
>the sine until they cross the saw, then it will give the slope of the saw
>until the sine crosses it again.  The OR function will do the same with the
>upper lobes.  If you take the AND and OR outputs together on two scope
>channels, you will reproduce the original sine and saw waveforms, but as
>mixtures of the two, one above and the other below the ground level.
>
>I have no idea what any of this would sound like if audio signals were
>processed through this beast, nor how one would usefully employ it as a CV
>modifier.  The concept is kinda cool, though.  I was just curious what other
>folks have done with theirs, although I can't see that anyone on the
>electro-music CGS forum has actually built one...