Filter-env on sampled voices + a gentle drum balance

fenv on samples (Paul: 'filter envelopes on samples are great esp when you want resonance and to mess with dynamics'): the recipe fenv key was inert on the native sampler lane (only synth models read it).

• Drum balance (Paul: 'drums in the louder genres are very hot — balance voices everywhere'): a gentle hot-kit level pull at the shared mastering choke point (press + stream + live-bake).

▶ Play it: Jackhammer Communion — parked on the genre this change names https://stellate.app/?genre=gabber&seed=3188&path=1809.17511,1828.17544,1790.17544&xdur=13.122

a13609a https://github.com/aboard-io/stellate/commit/a13609a42eeb97b8c45b4b9f4980009dd51285e5