I guess this can be done either with an always on instrument or with a UDO.
I have done a similar thing before using a midi note on as a trigger, I will look
for the CSD.

Victor

----- Original Message -----
From: Jim Aikin <midiguru23@sbcglobal.net>
Date: Wednesday, November 10, 2010 5:12 am
Subject: [Csnd] Modeling an Analog Envelope
To: csound@lists.bath.ac.uk

> 
> The other night I started musing about how one might model an 
> analog modular
> synth in Csound. In trying to model an envelope generator, I 
> find myself
> puzzled. I'm sure there must be an easy way to do it, using 
> reinit or
> something....
> 
> The desiderata:
> 
> 1) The "envelope generator module" is an instrument unto itself. 
> It sends
> its output via a global k-rate variable.
> 
> 2) This instrument is "always on" while the score is playing. It 
> doesn'tstart and stop in response to i statements.
> 
> 3) The envelope starts each time a global trigger signal goes 
> from 0 to 1.
> (Maybe later it will be gated rather than triggered. That's a 
> refinement I'm
> not yet ready to tackle.) If a new trigger is received before it 
> finishesmoving through its segments, it starts over from the 
> beginning.
> 4) The envelope does not loop. It cycles through once, reaches 
> its end
> value, and stays at the end value unless and until a new trigger is
> received.
> 
> The thing is, the only envelope generator I've been able to find 
> in Csound
> that accepts a trigger input is looptseg ... and I don't want a 
> loopingenvelope.
> 
> I've tried using reinit, but I can't figure out how to make a 
> reinit pass
> restart a linseg again from the beginning of its defined contour.
> 
> Am I approaching it all wrong? How would the experts do this? 
> Thanks in
> advance!
> 
> --Jim Aikin
> -- 
> View this message in context: 
> http://csound.1045644.n5.nabble.com/Modeling-an-Analog-Envelope-
> tp3258152p3258152.htmlSent from the Csound - General mailing 
> list archive at Nabble.com.
> 
> 
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> 

Dr Victor Lazzarini, Senior Lecturer, Dept. of Music,
National University of Ireland, Maynooth



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