[time-nuts] Digital Pots, wiper noise and fine tweaking oscillators

[Perry Sandeen]

Yo Bubba Dudes!,
Previous posts mentioned wiper noise and stability of a mechanical pots after tweaking.
My questions are:
Do digital pots after setting have wiper noise?
When making fine tuning tweaks to the EFC of an OCXO, can one move it to its *dead on* setting right away or is there some lag that must be considered requiring to do it in steps?
Regards,
Perrier