[sdiy] AR, AD envelopes

[mark verbos]

The Buchla 281 is like your AD/S it is a regular AD or if you flip a 
switch it will stay high as long as your gate is high, but always 
completes the AD cycle even if your gate is short.

Mark

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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