Arpeggiator that indexes pitch classes starting from the root note of the harmony.

I made a “root-indexed” pitch class arpeggiator in the Grid. You can use incoming notes as indexes to arpeggiate the harmony on another track. The indexes pick the pitch classes of the harmony, starting from the pitch class of the lowest note in the harmony.

Arpeggiates the incoming chord by indexing into the chord's pitch classes.

I made an “indexed” arpeggiator in the Grid. A quirk is that it indexes by pitch class. That is, index 0 always picks the lowest pitch class in the harmony (which may not be the pitch class of the lowest note).