[sdiy] VCO autotune for poly analog modular

[Tom Wiltshire]

On 4 Apr 2007, at 14:38, harrybissell at copper.net wrote:

> Should be easy to do by calibrating maybe five
> octave spaced points, then use linear interpolation
> within those note ranges. The Prophet V worked this way,
> and it was quite effective. That was a Z-80 iirc with very
> little RAM
>
> H^) harry

I second that. As others have said, you'd easily manage to do this  
with a modern uP. Storing a selection of points (octaves are an  
obvious choice, but you could go to half or quarter-octaves) and  
doing linear interpolation between them isn't too demanding. To make  
life easier, you could make sure the chip you use has a hardware  
multiply, since you'll need to multiply for the interpolation.