Andrew,
Unless I am missing something obvious, I think this can be done in other
ways with almost existing stuff. For keyboard tracking of a filter for
example, I would take 1-volt-oct-CV and run it to the FM1 input of the
filter (420 or 440). The input reversing attenuator could be used to bias
the effect in a positive or negative fashion.
For using it with a VCA, I would think something like connect the 1-v-oct CV
to one input on a 700. Use your VCA EG to switch the 700 so this voltage
is only biased in during the VCA on time. But, instead of using the EG
output directly to control the VCA, run it to a mixer and sum it with the ON
output of the 700 so that anytime the EG has the VCA open, it is biased by
some DC offset (attenuated and/or reversed) that is derived from 1-volt-oct.
These are just some initial thoughts on how I might try to implement
keyboard tracking. Of course, I have none of the traditional modular
experience like some guys here to fall back on, so these are really off the
cuff.
Larry H
----- Original Message -----
From: <ixqy@...>
In addition to many of the ideas mentioned, I'd like to see an
Oberheim-style Tracking Generator module. I use these often
when programming sounds on my Obie. Some of the many things
you can do with tracking generators are vary filter cutoff for
different ranges of the keyboard, scale LFOs, envelopes and
other mod sources for different shapes, etc. I also use
it for taming the VCA's output for different keyboard ranges.