[sdiy] ADSR Trigger/Retrigger behaviour

[David G Dixon]

In my view, an ADSR should retrigger from wherever it is, not from 0.  It
should only trigger from 0 if the gate is off. 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Olivier Gillet
> Sent: Friday, June 27, 2014 6:30 AM
> To: Justin Owen
> Cc: SDIY List
> Subject: Re: [sdiy] ADSR Trigger/Retrigger behaviour
> 
> The early version of the Shruthi had the "always restart the 
> attack from 0" behavior and I got complaints about it. I then 
> implemented the behavior described in your message and nobody 
> has ever complained about it since. Anything that generates 
> discontinuities (and thus
> clicks) is going to annoy some people.
> 
> Olivier
> 
> On Fri, Jun 27, 2014 at 3:08 PM, Justin Owen 
> <juzowen at gmail.com> wrote:
> > Hello,
> >
> > I'm looking at adding Trigger/Retrigger functionality to an 
> ADSR design I'm working on but it's not a feature I've used 
> that much so I was hoping for some clarification.
> >
> > I understand that while the Gate is High, the envelope will 
> restart from the Attack stage each time a Trigger is received.
> >
> > Most diagrams show the Attack section starting from 
> whatever output level the ADSR was at when the Trigger was 
> received. Two examples are this one from MFOS (top right):
> >
> > 
> http://www.musicfromouterspace.com/analogsynth_new/ADSR001/ADSR001_cyc
> > lediags.gif
> >
> > and the diagram in the Doepfer A-140 manual.
> >
> > ...so is this standard? The ADSR rests to the Attack stage 
> but the Attack starts at whatever level it was at when the 
> Trigger was received - or (perhaps just in an ideal world...) 
> would you expect the Attack stage to be reset fully and start from 0V?
> >
> > From a circuit POV I can understand why it would reset to 
> it's current voltage but I'd be interested to hear if people 
> who use this feature regularly would expect or prefer 
> something different.
> >
> > Thanks as always,
> >
> > - Justin
> >
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