[sdiy] 2164 Expo VCO tracking

[David G. Dixon]

> Hey David,
> what if you aligned the current bump right above 0V coming from the
> SSM's nonlinearity, with the negative frequency offset coming from the
> core reset time? This could make two wrongs into one right, making for
> an elegant solution, and might end up making the required HF
> adjustment smaller.

That's essentially what I've done.