[sdiy] Modulated ADSR Generator

[David G Dixon]

> > We had a discussion on the merits of various paramters back 
> in February.
> > (I'd forgotten that Andre Majorel suggested CV input back then.)
> >
> > Parameters for the knobs would be:
> >
> > * Attack time
> > * Attack shape
> > * Decay time
> > * Decay shape
> > * Hold level
> > * Sustain level
> > * Release time
> > * Release shape
> >
> > ...of which you get to assign six. I *could* do an analogue 
> multiplex
> 
> IMO, the only ones useful enough to bother with are (in order 
> of my perceived importance):
> *Release time
> *Decay time
> *Attack time
> *Sustain level
> 
> I have several CV enabled envelopes and quite frankly I 
> hardly ever mod them anyway.  I think having an elegant 
> implementation that doesn't require a massive panel for 
> functions that aren't essential would be a better physical 
> design.  Just because you *can* control something doesn't 
> mean you actually should or that the effort spent on 
> implementation yields useful performance results in the end.  
> Just my opinion.

I think I agree with James.  However, for the other two, I might add Hold
Level, and also think about Envelope Time (all the times scaling together,
but retaining the same envelope).