Richard, try a envelope follower such as Doepfer A-119. Insert the
signal to be followED, to the IN on A-119. Apply the Envelope Out
control signal to either of your VCAs CV IN, with the signal you want
followING applied to the signal input.

Tony

Richard Scott wrote:

>
>
> Hi
>
> thanks Ilanode, but actually this kind of quasi ring mod AM is exactly
> what I don't want. I want to accurately translate the amplitude envelope
> from one sound to another.
>
> Allen Strange's book led me to believe an AC capable VCA could do this
> for me - as an alternative to a complex envelope detector setup, but
> when i try I get exactly what you describe - AM distortion, or worse. So
> either i misunderstood him completely or my VCAs (analogue systems rs180
> and plan b LPG)are not AC coupled in the sense that he meant
>
> Richard
>
> ilanode wrote:
> >
> >
> >
> > I probably got you wrong but if you insert one audio into Signal In and
> > another one into CV In you'll get AM which re rs180sembles ring
> modulated sounds.
> >
> > You might want to patch the 2nd audio source into an External Input
> > module and use it's Envelope Follower output for the CV In of the VCA.
> >
> > But then, I might got you wrong.
> >
> > Best, Ingo
> >
> > --- In Doepfer_a100@yahoogroups.com
> <mailto:Doepfer_a100%40yahoogroups.com>
> > <mailto:Doepfer_a100%40yahoogroups.com>, Richard Scott
> > <richard_scott@...> wrote:
> > >
> > > Hi
> > >
> > > I am interested in using one audio signal to determine the
> amplitude of
> > > another. I think an AC coupled VCA or mixer is the way to do it What
> > > VCAs or VC mixers in eurorack format can offer this facilty
> > >
> > > Richard
> > >
> >
> >
>
>