having two cv inputs added to open the same vca is also useful:
one simple example would be having two asynchronous lfo's modulating one vca. this would create a weird kind of random-ish tremolo... or randomish fm index, if this vca's output ends up connected in the linear fm input of a vco.
plus many other weird effects....

of course, having a vca with only one cv input, but inserting, between this cv input and the modulation sources, a linear (and dc-coupled) mixer, is the same exactly as having a vca with many cv inputs.

 
Bakis Sirros


________________________________
From: Zoë Blade < zoe@... >
To: Doepfer_a100@yahoogroups.com
Sent: Sunday, April 22, 2012 8:42 PM
Subject: Re: 1 Those new to modular synths.


 

> yes, in a VCA (for example A131 or a132) the cv 1 and cv2 are added together they are not multiplied.
> so, in order to achieve the notes closing, you would need two vca's in series.
>
> one vca to be controlled by the ADSR cv, and one VCA after it (or before it) to be controlled by midi note velocity CV, of the midi to cv converter module.

Thanks, that makes sense! I was trying to work out what I'd need to achieve the effect I was after, and got as far as "not the mixer, because that also adds, rather than multiplying."

Out of curiosity, is there anything that's made easier to do with the adding of CV1 and CV2 that I haven't thought of I'm considering swapping out my A-131 for an A-132.3 (so I can occasionally use the linear mode of one of them for FM synthesis). I did have reservations about losing the ability to use, say, an ADSR and velocity at the same time, but from what you've just told me, it sounds like I'd actually *gain* that ability instead if I simply use both VCAs in serial in exponential mode, and I never had it to begin with.

Thanks, that's helped me quite a bit!

Zoe.


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