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

[Tom Wiltshire]

I think Florian was proposing different ways you can get non-linear control into a VC system.

I think that while Mattias might have proposed a system that would be *hard* to subject to voltage control because of the heavily non-linear nature of the  components and circuits, I don't see why it would be *impossible*. Sure, you'd have to be careful not to change the behaviour while making changes to allow for voltage control, and that's going to be tricky. If you're swapping (for example) some transistor that operates across a whole wide section of its range rather than just neatly within the linear region, that's clearly going to be harder to match effectively with something like a VCA. It's probably hard enough that it's not really *worthwhile* and certainly not *cost effective*, but that wasn't really the question asked. Is it possible? I'd still say yes.


> On 8 Feb 2024, at 14:14, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Thanks Florian, not sure what you're trying to say - does an expo
> converter make things impossible to control via CV? (of course I know
> it doesn't but I don't understand your email)
> 
> On Thu, Feb 8, 2024 at 2:56 PM Florian Anwander
> <fanwander at mnet-online.de> wrote:
>> 
>> Hi
>> 
>> On 08.02.24 13:53, cheater cheater via Synth-diy wrote:
>> 
>> Modern voltage controlled synth modules have non-linearities too, so
>> what? That doesn't make them non-voltage-controllable. Have I
>> misunderstood what you mean?
>> 
>> Then the voltage that is sent may change in a non-linear way (the values are usually computed and then the "non-linear" voltage is generated in a D/A-converter), but the relation voltage to control on the module will be linear. Or the other way round: the voltage change is linear but there is a "de-linearizing" circuit in the controlled module. Example: expo-converter in V/Oct. controlled VCOs.
>> 
>> Rgds.
>> 
>> Florian
>> 
>> 
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