Idea for an envelope generator
Christopher_List at sonymusic.com
Tue Jan 30 14:52:38 CET 1996
I was thinking about something for an n-step envelope generator today and I
wonder if anyone's tried it (I've got so many circuits in the works now that
it'll be a while before I get to play with this one).
Suppose you had a two channel sequencer (analog, of course).
Make channel A your voltage levels and channel B is your delay times.
You run the output of channel B into the CV of a linear VC slew limiter.
You split channel A. One line goes into the input of the slew limiter. The
other line goes into two amp amp circuits. One adds a millivolt, the other
subtracts a millivolt - these two signals become the high and low reference for
a "window comparator" (two comparators and a NOR gate, I think). The output of
the slew limiter is your envelope output and also get's routed into the input
of the window compator. Lastly, the output of the comparator gets routed back
to the trigger input of the sequencer.
Is there an easier way of comparing two voltages?
I haven't worked out the logistics of starting / ending the process - any
Has anybody tried this? - I haven't built a sequencer yet, but it seems like it
would be a cool mod for an existing sequencer. You could just put in an "auto
step" switch which would route the signal through this circuit and automaticly
step the sequencer as it reached each value...
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