The Interval Option works exactly like the Octave Control, but allows for fine-tuned interval differences instead of changing by octave. If you are currently using either the “Keys” or “Hold” option, this will play your selected notes, and then the same notes transposed up by the value the Interval is set to (in semitones). If you have a custom arpeggio programmed, the arpeggiator will play through the entire sequence before moving it up the selected interval.