MIDI Controllable Pots

[Antti Huovilainen]

On Mon, 18 Oct 1999, Andy Main wrote:

> link this via logic to a DAC and then control a FET as a voltage
> controlled resistor.
> 
> Has anyone tried to do this before?  Or are there better solutions (I'm
> sure I can't be the only one who has wanted to do this).

Making the whole thing purely voltage controlled instead of trying to
"emulate" the pots of a "normal" synth sounds like a better idea. The only
place I can think of where emulation is needed is ADSR envelope if you
want exponential attack/decay/release. LM13600 application notes have a
circuit that acts as voltage controlled resistor for those parts that
really need one.
I haven't tried any of this, so it's all theory still.

Antti

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