AlKal
My guess is that he’s is talking about “quantizing” to a pitch gird or scale. The Range in Melodyne (or “spread” as the OP refers to it) is how close you want to get on the exact pitch.
No... I don't use quantize... But the LFO tool in VV allows you to tighten the pitch to its center... Lessening the range a pitch drifts about its center... Like a pitch compressor...
In Melodyne they call that spread and in the same dialog they also have a tool for adjusting that overall range to how centered it is on the pitch as opposed to hitting the pitch at its peak (upper or lower)... I simply do that manually in VV as I decide how I want the pitch to occur...
I find a lot of cleaning up pitch issues often is corrected by tightening the range. Thereby allowing the humanity of the shifting to remain, but forcing it to be closer to the pitch...
Keni