[sdiy] Unique sounding modules that can't have voltage control?

[cheater cheater]

On Thu, Feb 8, 2024 at 7:28 PM Jacob Watters via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> "Again hypothetical and stretching the definition of the question, but maybe some circuit involving an adjustable capacitor?"
>
> You could use a switched capacitor circuit with CV controlled PWM.
>
> Jacob Watters
> JacobWatters.com

let me cull that conversation right there

> On Thu, Feb 8, 2024 at 1:15 PM Didrik Madheden via Synth-diy <synth-diy at synth-diy.org> wrote:
>>
>> I suspect that in every relevant "weird" case you can cheat(!) the
>> system with some brute force by building a vactrol like circuit.
>> Connect one or two LEDs to one or two light dependent resistors, as
>> necessary based on the pot connection. This might take some nontrivial
>> processing of the signal on the LED side to linearize the response and
>> potentially balance the high and low leg of the potentiometer so it
>> always matches the full resistance across the potentiometer. Maybe
>> there are some circumstances where such a circuit wouldn't work but I
>> can't really think of any off the top of my head.
>>
>> Maybe some (guitar) amplifier circuit where the potentiometer is a
>> rheostat and needs to handle a large amount of power being dumped into
>> it? (Stretching the definition of the question, I know.)
>> Maybe some of Metasonix' tube modules are doing something wild that
>> can't really be voltage controlled? Maybe ask Eric Barbour directly
>> for suggestions.
>> Again hypothetical and stretching the definition of the question, but
>> maybe some circuit involving an adjustable capacitor? Although you
>> would find those mainly in radio tuners and I doubt you'd find one in
>> an audio frequency circuit.
>>
>> /Didrik
>>
>> On Thu, 8 Feb 2024 at 18:21, cheater cheater <cheater00social at gmail.com> wrote:
>> >
>> > Hmm so let's try to narrow down the question
>> >
>> > What are circuits where:
>> >
>> > 1. the circuit is available as a modular synthesizer module, or a
>> > similar subcircuit in a non-modular synth
>> >
>> > 2. the module has a resistive potentiometer or slider on its front panel
>> >
>> > 3. the module does not have a cv input for the same control
>> >
>> > 4. adding a cv input is either impossible or would change the sound of
>> > the circuit in an important way
>> >
>> > On Thu, Feb 8, 2024 at 5:55 PM Didrik Madheden <nitro2k01 at gmail.com> wrote:
>> > >
>> > > Interesting question, and the answer really depends on the definition
>> > > of the question. Low hanging fruit would be a theremin. Not a module
>> > > as you requested, but just to make a point. The body of the performer
>> > > is an integral part of the circuit, so it would qualify at least in
>> > > that regard. But, what if you built a voltage controlled robotic arm
>> > > that controlled a replica of a human arm, and you now have a bonafide
>> > > voltage controlled theremin. :)
>> > >
>> > > You might be interested in the diverse work of the artist Gijs
>> > > Gieskes. His works are not always eurorack modules, and they generally
>> > > do feature control voltage inputs. However, I feel like much of his
>> > > work would fit the spirit of your question. Some of his modules use
>> > > mechanical and electromechanical devices like relays, motors, optical
>> > > detectors modulated by a physical cam and so on to generate sound. The
>> > > sound would often depend on the exact physical layout of the product,
>> > > so you could argue that the sound is uniquely characterized by that. A
>> > > Gieskes module might in that case have a VC input for the speed of the
>> > > motor rotating the cam to take an example. Technically a voltage
>> > > control, however what's controlled is a mechanical device and not a
>> > > purely electronic device.
>> > >
>> > > https://gieskes.nl/
>> > >
>> > > /Didrik
>> > >
>> > > On Wed, 7 Feb 2024 at 19:23, cheater cheater via Synth-diy
>> > > <synth-diy at synth-diy.org> wrote:
>> > > >
>> > > > Hi all,
>> > > > I'm looking for synth modules or circuits which have parameters that
>> > > > cannot be voltage controlled - and which have a unique sound that
>> > > > similar circuits compatible with voltage control cannot recreate.
>> > > >
>> > > > Thanks!
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