[sdiy] Envelopes and gates from guitar

Mr&MrsAccount hbissell at wowway.com
Fri Jun 16 19:51:28 CEST 2023

Hi Dieder (et. al.) 
http://larry.retrosynth.com/larry/guitar.htm look for "Muffy III" schematic which is a six channel guitar processor using hex fuzz. 
Each string has a separate envelope follower that has faster attack than is possible with an averaging filter, but still can respond quickly to a sudden loss of signal. It is best with a monophonic input. 
It was published here, but it seems to have lost all the schematic drawings and other illustrations. https://www.edn.com/envelope-follower-combines-fast-response-low-ripple/ 
If you try this on something other than a guitar, it may not be worth the complexity.  If you are processing drums, a simple peak detector might be better. And if you are trying to process 
full range audio, the ability of the circuit to turn off quickly when the input stops is lost. 

-----Original Message-----

From: NT <nathan at idmclassics.net>
To: Didier <didierleplae at yahoo.com>
Cc: synth-diy at synth-diy <synth-diy at synth-diy.org>
Date: Friday, 16 June 2023 10:46 AM EDT
Subject: Re: [sdiy] Envelopes and gates from guitar

 Paging Harry Bissell... I'm not sure anyone else on the list has dedicated as much attention to guitar synths/processing as he has. 
Is your goal to extract envelope/gate from single strings or the full signal?  
The External Signal Processor from the Korg MS-20 is a very useful circuit worth looking at, but IIRC requires at least one multigang pot that could be difficult to get, though may be available now due to Eurorack clones. 
  On Thu, Jun 15, 2023 at 11:59 PM Didier Leplae via Synth-diy <synth-diy at synth-diy.org> wrote: Greetings synth diy list,
Does anyone have any good examples of designs or general thoughts pertaining to envelope followers and gates from a guitar signal? 

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