MOTM

>  My conclusion as that  controlling Attack rate and Attack level,
>  as well as scaling the entire envelope, via velocity, are very useful.
>  VC control over Decay, Sustain, or Release weren't that useful.

Not to disagree with you, but I've got two VC ADSRs in my system, and I
control the sustain and release times a LOT with various controllers.  I
note that I especially do this a good bit with little running percussive
sounds where certain hits my have accents or a little longer decay than
others, but the attack doesn't change.  I'll often do this with a slightly
randomized LFO as well and can generate some wildly varying, but useful,
sounds for each note of the pattern, which usually gives the impression that
there's a lot more going on than a single monophonic line, especially if
using a synchronized delay as well.

Each of us has our own patching styles. I would guess that once you start
using a VC ADSR, you'll find more ways to make good use of the various
options available.

Adding a trigger at the end of a particular cycle so we can retrigger the EG
makes the until even more useful, as we can now get double or triple duty
out of the module since it can now become an LFO or, if design allows, an
audio range oscillator.  Think about using the module as an LFO, with
separate VC of rise and fall rates - now you've got a LFO with VC control of
the waveform shape.....

Such a module is almost a small synth unto itself....

Such a device, with VC of *all* parameters, would be not only a useful
addition, but a welcome one to the MOTM line-up.

My two cents worth anyway...