[ggegan]

Vocal projection is a big issue with regard to performance. Vocal quality changes significantly depending on how much the actor pushes their voice.

ADR mixers have to be very careful about giving actors direction in order not to run afoul of the pecking order, but I often was able to surreptitiously alter the actor's delivery by raising or lowering the headphone level.

Higher level = more projection, lower level = softer delivery.