MOTM

First I must heartily apologize to Roy. I didn't read his post (below) 
thoroughly enough to see that he had only mentioned the 15 pot idea as ONE 
option, and that an option similar to what I was thinking of immediately 
followed. Sorry Roy! I've got to read more closely.

Here's what I'd imagined:

Three pots (or encoders):
1) VC IN (per stage).
2) Time to end point.
3) Set end point (voltage).

Next/Prev arrows (similar to what Roy describes below) to select the stage.

Some way to select the degree of the exponent for a change of state (I'm not 
exactly sure how the to describe the attack portion of a typical EG -- 
exponential with reverse orientation)? Moe and I will like the "whompass" 
(and more!) attack stages that are readily available.

How about 8 LEDs (one for each stage) -- changing at the rate of the voltage 
of that stage in a smooth and soothing fashion.


I think this would be a great module, and not difficult to operate or overly 
expensive in any way.

I know several people didn't like the notion of using uP in their analog, but 
I'd still like to think about this in addition to the current VC EG.

I still like the VC DADSR idea too!
JB

In a message dated 2/1/2000 12:44:49 PM, roytate@... writes:

>It would HAVE to have a gate-detected indicator LED at least, and you
>could flash that when it changes stages.  My latest (2 year old) idea
>for a multi-stage EG consists of a series of 8 stages, with each stage
>having 3 parameters:  ramp-to voltage, ramp rate and sustain switch.
>The ramp-to voltage and ramp rate allow various timings and slopes, and
>the sustain switch causes the processor to stick on that stage until
>it detects a gate off.  I planned on using a PIC chip as a controller
>for JH's VC EG idea using 2 NPN and 2 PNP transistors.  This seemed to
>be easier than using a DAC.  I would use a window comparator to determine
>when to change stages.  This is quite similar to the Roland MKS-50 EG,
>only extended beyond ADSR.
>
>I would LOVE for something like this to become a MOTM module!
>
>I would envision a multi-stage EG as having 15 or more knobs and 
>6 sustain switches; or 2 rotary encoders, 3 push-buttons and 
>an LCD panel [add 8 jacks for voltage controll].  The buttons would 
>be next/prev stage and sustain toggle.  You could also use the 
>next/prev buttons as next/prev feature if you added several parameters
>to each stage.
>
>The 16 knob variant starts sounding like a sequencer doesn't it?
>Either way, a PIC controller tied to an analog VC-EG stage would 
>allow for voltage control without worrying about stepping.
>
>Either way, I'm not against your idea, and in fact would like to 
>have one.  You could add a gate delay, and a punch option to a
>digital EG quite easily.  And for what it's worth, I vote for
>using a PIC since I already have a PIC programmer.
>