Arpeggiation

Arpeggios

An arpeggio plays the notes of a chord one at a time rather than all together. This creates a flowing, harp-like texture.

Cycling Through Chord Notes

Given a chord as a MIDI array, an arpeggiator cycles through the notes:

arpNote(chord, step) = chord[step % chord.length]

The modulo operator (%) wraps the step index back to the start when it reaches the end of the chord.

Example: C Major Arpeggio

chord = [60, 64, 67]   // C4, E4, G4

step 0 → chord[0 % 3] = chord[0] = 60  (C4)
step 1 → chord[1 % 3] = chord[1] = 64  (E4)
step 2 → chord[2 % 3] = chord[2] = 67  (G4)
step 3 → chord[3 % 3] = chord[0] = 60  (C4, wraps!)
step 4 → chord[4 % 3] = chord[1] = 64  (E4)

Your Task

Implement arpNote(chord, step) returning the MIDI note at the given step.

Run your code to hear a C major arpeggio ascend and descend.