[sdiy] Lin/Log VCAs and envelopes - compensating for log VCAs

[Tom Wiltshire]

Yeah, I've done the same thing. My PIC VCADSR has linear or exponential envelopes selectable. But that's not exactly what I'm suggesting here.

Instead, I was thinking of doing a normal exponential ADSR for use with a linear VCA, and a "log compensated" ADSR for use with a log VCA. This would have a linear decay and release, but an extreme curve to the attack section to give the typical shape even with the log VCA.

Tom

On 11 Feb 2016, at 09:14, Roman Sowa <modular at go2.pl> wrote:

> It was too easy not to implement it, so I did that on my EG too. One switch determines exponential or almost-linear curve for attack and the other one for 1st decay. It simply changes the voltage charging the timing capacitor.
> Here's example scopeshot of both settings:
> http://www.sowa.synth.net/modular/addsr_punch.jpg
> 
> Roman
> 
> W dniu 2016-02-10 o 23:27, P Maddox pisze:
>> Tom,
>> 
>> On 06/02/2016 19:08, Tom Wiltshire wrote:
>>>  Being able to switch between the two curves would enable people to
>>> use either a log or linear VCA and still get the same effect.
>>> 
>>> What do you all think?
>> That's what we do with 001/002/002R, you have the option for "linear" or
>> "exponential" Envelopes.
>> Exponential "sound" quicker than linear but give the typical "synth" sound.
>> 
>> P
>> 
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