While scanning through the list archives I noticed a certain lament
that the MOTM 800 EG does not allow voltage control over the ADR
times. Although that would be a useful feature, I am much more
curious as to how one would add an initial delay that would change
the 800's ADSR envelope into a DADSR (delay, attack, sustain,
release). A gate delay circuit is not difficult to build, but
creating a one off panel is a lot of work (for me) for such a simple
circuit.
I figure a delayed ADSR can be constructed by cascading two 800s. The
first 800 accepts the keyboard gate signal, the + output of this 800
feeds into the gate of the second 800. The second 800 will not fire
until the Attack phase of the first 800 has passed the gate
threshold, therefore the delay time of the second 800 is set by the
Attack time of the first 800. I don't have any 800s to test this
theory so I'm hoping someone can answer these questions:
1. At what voltage threshold on the gate input does the 800 fire?
2. What is the maximum delay time that can be achieved using this
scheme? It would depend on how slow the Attack time can be set and on
the answer to question #1.
3. Is there some other way of creating a gate delay without resorting
to custom modules?
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Scott Juskiw
scott@...