[sdiy] AR, AD envelopes

[Ian Fritz]

Hi Harry et al. --

 >>>>>
At 05:09 PM 4/19/2004, harrybissell wrote:
I don't know about AR and AD  :^P

My envelope generators have two modes... lock in and non-lock in

In lock in, they will go to full attack peak before decaying.  If the gate is
still high, they will sustain.

In non-lock in, they will attack only while the gate is high... drop the gate
early and they go back down.

Both modes are quite useful... non-lock is especially good as a controller
for modulation amount... or for long pads with filter sweep.

H^) harry
<<<<<


Very interesting!  I've never used the standard ADSR generators, myself.  I 
mainly use the really old method of mixing an AD with an AR.  If the attack 
times are the same, then I have the standard ADSR.  But if they are 
different, then more complex envelopes can be obtained.  With these 
modules, the AR always goes into the release phase when the gate resets, 
but the AD, has a switch just like yours.  I refer to the two modes as 
"muted" or "non-muted", these being the same as your "non-lock" and "lock", 
respectively.  There is a writeup in EN somewhere.

I also have another somewhat unusual EG that I never wrote up.  I always 
have trouble remembering how it works, and I don't even have a good name 
for it yet -- just "AD Generator with Muting and Monostable drive."  It has 
three inputs: Gate, Trigger and Mono.  A pulse to the Mono In drives two 
monostables in series, the first to define a delay time and the second to 
drive a variable-width pulse.  With muting off, a Trigger input pulse 
produces a standard (full, or locked) AD envelope, whereas a Mono input 
pulse produces a (delayed) AHD envelope, where the hold time is derived 
from the monostable width.  With a Gate signal attached and Muting on, the 
envelope goes into Decay whenever the Gate resets.

   Ian