Dynamic switcher?

[Dave_B]

Has anyone built a circuit that fades an effect in/out dynamically?  For example, as you strike a chord, your awesome distortion could morph into a sparkly chorus effect as the chord loses amplitude.

I know someone manufactures a pedal that does this sort of thing with a Vactrol but I can't remember who and I don't think they had a schematic anyway.

Dave

[R.G.]

It's easy. See "Audio VCA applications" at GEO, and think what you can do with an envelope extractor. The result is easy.

[KMS]

Thanks R.G. I'll check that out too.

[Dave_B]

It's easy. See "Audio VCA applications" at GEO, and think what you can do with an envelope extractor. The result is easy.

Thanks, R.G. It's probably me, but I couldn't find a reference to that on your site.  Can you tell me what section it's in?  I think I looked everywhere.   

[Paul Perry (Frostwave)]

http://www.geofex.com/Article_Folders/VCA%20Applications.pdf.
is probably the required site. I can never find anything at Geofex, so I use google (in this case I searced for
vca geofex  ). It's a mistake not to read EVERYTHING at geofex, at least once.

[Dave_B]

Thanks Paul.  In fairness, it was on the front page under "Applications of an audio Current Controlled Amplifier." Posted 2/14/04.  I just didn't see it searching for "VCA" on the site.

[Dave_B]

As a followup, the stompbox I was grasping for was the Toadworks Enveloope. 
http://www.virtualtoad.com/el/index.html

The double meaning of looper makes it hard for someone who's already search challenged. 

[R.G.]

GEO is hard to navigate.

I had an offer from a guy who does web pages to revamp it for me to make things easy to find. I said sure, help me out. I never heard from him again. Scared him off when he saw what he got into, I guess.

I have several designs for fadeover morphers to fade from one loop to another for a similar kind of effect. I didn't envision doing it envelope controlled, but otherwise it's the same thing.

[cd]

Is it just me, or is that "Applications of an audio Current Controlled Amplifier" cut off in places (some paragraphs go to nowhere) and a few typos here and there (shouldn't the "-1" building block be labelled inverting, not non-inverting)?