I used to do envelope (env1) withing an overall envelope (env2 
inside of env1) using a moog synth (back in the mid 1970's). 

I think the mini-Moog had two Envelope Generators so that 
was possible. There was a bit of a trick to it, it's been a
while. Now I need to get my Moog Prodigy up and running so I 
can try that out again.

I would do a dual trigger, where while one note is sustained,
trigger second envelope within that. 

"Multiplying" two envelopes probably would give you zero. Try 
a different math op, like a sum/difference. Trigger the first
note, sustain it, then trigger a second one underneath the 
envelope of the first. 

Not sure how I would implement that in Csound. Probably in the 
score with multiple lines triggering at differing times going 
thru two VCA's triggered by different EG's. Run the results thru 
an amp/gain stage within Csound. 

Something like that. Trying to remember how I used to do it with
the mini-Moog. It's been a while. Thanks for the flashback.


-Partev


================================================================



--- aaron@akjmusic.com wrote:

From: Aaron Krister Johnson 
To: csound@lists.bath.ac.uk
Subject: [Csnd] Re: RE: envelopes for restriking an instrument
Date: Fri, 11 Jun 2010 09:27:08 -0500

Iain,
Now   that  I'm  looking  at  this,  I  don't  think  it  would
work....multiplying two envelopes together where one of them is at 0
will give you 0! So, we'd still get clicks....However, I think the
instinct of using separate envelopes seems correct. Back to the
drawing board.
I wonder what's going on with me these days that I'm puzzling over
two CSound instruments simultaneously that involve complex envelope
triggering?
AKJ

On  Tue,  Jun  8,  2010  at  8:58  PM,  Aaron  Krister  Johnson
 wrote:

Iain,
Thanks for responding so quickly a few days back....when I get a
moment I'll look into this. It looks like a workable solution; I'll
let you know.
AKJ
Iain McCurdy wrote:

---------- Forwarded message ----------
From: Iain McCurdy 
To: 

  Date: Wed, 2 Jun 2010 09:01:35 +0000
  Subject: [Csnd] RE: envelopes for restriking an instrument
  adecay linsegr 1,3,0,0.1,0
  aattack linseg 0,0.3,0,0.01,1,1,1
  aenv = adecay * aattack
  is something like this a possibility?
  The natural decay time of the resultant envelope is 3 seconds but
  if a note is turned off before this is completed (e.g. by a new
  note  being played) a release time of 0.1 seconds is used to
  simulate the time it takes for the thumb to damp the tine. The zero
  flat line of 0.3 seconds of the attack envelope allows this release
  segement to complete before the new note begins. As a result of
  this the actual decay time of a note will be 0.3s shorter, i.e. in
  this example 2.7s. You will need to ensure that old notes are
  turned off if new notes overlap either in the score or by using
  turnoff2 etc.
  Let me know if any of this helps.
  Iain
  ______________________________

__
> Date: Tue, 1 Jun 2010 22:05:17 -0500
> From: aaron@akjmusic.com
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] envelopes for restriking an instrument
>
> Hi all,
>
> I have an elegant FM kalimba instrument. I want to use numbered
'x.yy' instruments called with 'event_i' from a helper instrument to
trigger it, so that there is a 'legato' envelope. Not sustained
legato,  mind  you, but I'm hoping that the new instance of the
instrument will take an amplitude value from the old, bring it to
zero quickly before reinit of a new percussive envelope. This is akin
to how the thumb on a kalimba stops the sound of the kalimba (if it's
the same tine (pitch)) just before restarting it on the downstroke of
plucking.
>
>  I know this is possible, and I know it's similar to a legato
instrument, but the examples I see all seem to talk about legato
instruments where there is a sustain portion of the envelope....i.e.,
the instrument always has a constant energy source. How can one
translate this idea to a more percussive envelope, so that we can
keep a decay/release segment going, have it stop and quickly attack
again, w/o clicks?
>
> Best,
>
> Aaron Krister Johnson
> http://www.akjmusic.com
> http://www.untwelve.org
>

  --

Best,
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org

--
Best,
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org




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