Mantle

Load the fault and let it slip: energy, brittleness, depth — plus a click for attack bite, an aftershock echo, and a foreshock build.

The amp envelope + how the keys play: velocity response, voice allocation, and glide between notes.

Make the ground live: a quaking tremor, stressed-rock creak, and a booming attack pitch-drop. All start off — dial them in.

The ringing normal modes and the felt sub: how many ring, how long, how harmonic, and how far the boom rolls.

Saturation glues the sub to the body and tames peaks; the master low-pass sets the top before the limiter.