The pump is in the routing, not the notes
A sustained low pad holds an A major chord for sixteen bars while a kick plays sixteenth-notes over it. The breathing, ducking swell you hear isn’t drawn into the pad’s notes — it comes from one effect:
type: compressor
sidechain: kick-track # ← duck this signal whenever the kick hits
threshold_db: -28
ratio: 8
attack_ms: 1
release_ms: 140
The compressor sits on the pad but listens to the kick. Every kick hit clamps the pad down, and it swells back in the gaps — classic sidechain pumping. The pad’s chord never changes; the rhythm you hear is the kick reaching across and shaping it.