Pitch

A semitone is one key on a piano, C to C#. Twelve semitones make an octave, the same note at double the frequency, or half of it. +12 is up one octave. −12 is down one.

The audio editor shifts a region from −24 to +24 semitones, two octaves either way. The fine control covers half a semitone on top of that. The slider keeps the region’s length and changes only pitch, and it applies when Stretch is selected. In Pitch mode, dragging a warp marker changes timing and pitch together, and the semitone slider does not apply.

A cent is a hundredth of a semitone. Micro-tuning in the Advanced tab moves each of the twelve notes by cents. The Tuning page suggests shifts of about 5 to 15 cents when you want two layers to stop locking together and still read as one note. Two pitches a few cents apart beat: a slow pulse in loudness. That pulse is what a second oscillator, slightly detuned, is for. Wider than that, you hear two pitches.

The project reference is A = 440 Hz unless you change Base Frequency under Tuning. Lowering it, for example to 432 Hz, drops every note together, so the intervals stay.