[sdiy] 2164 Expo VCO tracking

[David G. Dixon]

> When checking tracking, one has to be very careful
> not to have the temperature of any of the parts change
> while measuring. Otherwise, temperature effects will
> complicate matters.
> A bit of breeze in the room can wreak havoc.
> Even if everything is accurately and fully temperature compensated,
> if it is possible for different components to be differently exposed to
> air currents, then the measurements will be off.

Paul, that's the least of my worries at the moment, but point taken.