Yes. If you would like to change Capo’s pitch adjustment on a finer increment than the semitone scale, there are two ways you can go about this.
By holding the shift key, you can disable Capo’s semitone locking while dragging the mouse.
For the finest pitch adjustment, you can hold the shift and command keys while pressing the up/down arrows to modify the pitch by 1 cent (1/100th of a semitone) at a time.
