[sdiy] Blackmer VCA cell

[Mike Bryant]

> Would it be possible to redesign the CV envelope generator curve to work with an exponential control VCA?

Yes it is.  I think Neil was being a little bit sweeping as quite a few synths used to have log VCAs with linear envelope generators.  But the accuracy of the log VCA doesn't need to be that good so an expensive solution would be overkill.  In my digital designs I always allow the envelope to be varied anywhere between pure linear and pure log anyway (easy in digits) as they can give quite differing nuances to the sound.  


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Brian Willoughby
Sent: 23 October 2021 22:26
To: *SYNTH DIY
Subject: Re: [sdiy] Blackmer VCA cell

On Oct 23, 2021, at 13:53, Neil Johnson wrote:
> Their control function is exponential, linear-in-dB which is great for audio fading so they are not suitable for the traditional envelope generator that needs a linear control VCA.

Would it be possible to redesign the CV envelope generator curve to work with an exponential control VCA?

I haven't thought this through, but I can imagine different ways to generate an envelope - both linear and logarithmic. What I don't know is whether you'd actually need anti-log CV to get the right results out of an exponential control VCA for envelope purposes.

Brian

p.s. Thanks for starting an interesting thread, Ben.


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