Hey Phil!
An OTA used as an input buffer with a linear current control source
would be an easy way to control the audio inputs to the poles. A
very fun tutorial for experimenting with OTA's in synth circuits can
be had from Thomas Henry. Check out http://www.midwest-analog.com/
for a list of his books and other products.
Any simple VCA could do the job as well, if you wanted to "keep it
modular" (K.I.M.?) and allow for maximum flexibility. Perhaps if you
built a triple or quad VCA to facilitate that sort of control over
the Steiner/Stone VCF, you'd be happier with the system overall. The
VCA's could then be modulated by any source - EG, joystick, what-have-
you.
BTW - I think Ken's Steiner VCF is one of the most fun filters
around! Modulating the inputs will definately coax some strange
noises from from it. Not that you need to work too hard at doing
that!
An OTA used as an input buffer with a linear current control source
would be an easy way to control the audio inputs to the poles. A
very fun tutorial for experimenting with OTA's in synth circuits can
be had from Thomas Henry. Check out http://www.midwest-analog.com/
for a list of his books and other products.
Any simple VCA could do the job as well, if you wanted to "keep it
modular" (K.I.M.?) and allow for maximum flexibility. Perhaps if you
built a triple or quad VCA to facilitate that sort of control over
the Steiner/Stone VCF, you'd be happier with the system overall. The
VCA's could then be modulated by any source - EG, joystick, what-have-
you.
BTW - I think Ken's Steiner VCF is one of the most fun filters
around! Modulating the inputs will definately coax some strange
noises from from it. Not that you need to work too hard at doing
that!
> --- In cgs_synth@yahoogroups.com, "Phil" <pditullio@b...> wrote:
> >
> > Hi Mike,
> >
> > Thanks for the info I am learning slow but sure.
> >
> > One other question can this also be accomplished using OTAs?
> >
> > Phil