[sdiy] AR, AD envelopes

[harrybissell]

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

Tim Parkhurst wrote:

> Hi All,
>
> Okay, this should be a stupid simple question, but I want to make sure I've
> got it correct in my mind. The more I thought about it, the more I realized
> I wasn't 100% sure. Basically, I'm trying to straighten out the differences
> between AR and AD envelope generators. Here's what I've got...
>
> AR Envelope: Attack cycle begins when gate signal goes high. If the gate
> signal goes low before the Attack cycle has completed, the envelope will
> immediately jump to the Release cycle. If gate is still high when Attack
> cycle is complete, envelope remains at peak level until the gate goes low,
> at which time the Release cycle begins.
>
> AD Envelope: Attack cycle begins when gate signal goes high. The attack
> cycle completes and then the envelope goes to the Decay portion regardless
> of the status of the gate signal.
>
> Is this correct? Is there a need for an AD/S (Attack, Decay with Sustain)
> envelope? In this one, the attack cycle would complete, the envelope would
> remain at peak level as long as the gate signal was high, and then go to the
> Decay cycle as soon as the gate went low (this is a little different from
> the AR envelope in that the Attack cycle would always finish, even if the
> gate goes low before the Attack is complete).
>
> Again, this should be butt-simple stuff, but I just wanted to make sure. I'm
> laying out a simple little EG, and I was curious as to whether the extra AD
> and AD/S modes would be worth it. I await your comments, wisdom and insults.
>
> Tim (sweating the details) Servo
>
> "Imagination is more important than knowledge." - Albert Einstein
>
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