[VariAudio] More precise - Acoustic Feedback tool

With this option we can tune more precise.
Now, to hear changes, we should release dragged note, to hear result.
its too anoying, and sometimes make bad resoults.
lets see how it works in melodyne

Same question goes to midi - [Key Editor] Preview tool improvement - #2 by Moortrum

Preview whyle holding Mouse Button - is very helpfull and make work process much faster

Thanks!