This Learn Live segment breaks down how modulation differs from automation in Ableton Live, using a bass note running through a filter. Automation sets a parameter to specific values over time, while modulation moves that parameter relative to whatever value it's already at, effectively scaling the range of an existing move rather than replacing it.
On a long bass note, drawing a rising modulation ramp over an existing automation curve makes the filter's movement progressively more dramatic as the clip plays. The modulation defines how much of the automated movement gets applied, so the same automation curve can sound subtle or extreme depending on the modulation shape layered on top.
The two also suggest a useful workflow order. Set modulation on Wavetable's filter first, then freely experiment with the cutoff live, since the modulation pattern stays fixed while you audition different automation ideas.
Once a movement feels right, record it in as automation to lock in that specific take. This separates open-ended sound design from committing to a final result, letting you explore filter movement without losing your place.