This Ableton Live 12 tutorial covers two MIDI transformation tools used in sequence on a bass pattern: Add Interval and Arpeggiate. Add Interval thickens a single-note bassline by stacking new notes on top, turning it into chords, which then become the raw material for the next step.
Arpeggiate takes those chord tones and spreads them into a moving melodic pattern. The style setting determines the overall shape of the arpeggio, while rate and gate control how fast the notes fire and how long each one sustains. Two additional parameters, transposition distance and step repetitions, let you push the arpeggio further from the original pitches and extend how many times the pattern cycles through its transposition.
Used together, the two tools show a clear workflow: build harmonic content first, then animate it. That sequence is the actual lesson here, and it applies to any situation where a static bassline needs more movement without rewriting it from scratch.