[sdiy] Linear response VCOs?

[Gordonjcp]

On Fri, Mar 20, 2026 at 10:40:57PM +0000, Tom Wiltshire wrote:
> The Korg Polysix kind-of was. The VCOs were linear, and there was an expo convertor that was multiplexed out to each of them, if I remember. There's a schematic I drew of the VCO design flying around on the web.
> 

How do they get tuned, and what's the kind of optocoupler thing associated with CV generation for?

-- 
Gordonjcp