UNDERTOW is a reverse-swell cutter for producers who want a transition to inherit the exact timbre of the sound it announces. Load a local vocal, chord, cymbal, or use the built-in fixture. Drag around the useful source fragment, then sculpt a five-point swell contour instead of accepting another generic linear fade.
The instrument keeps one authored character: a dark, diffused stereo suction cloud that resolves into the source transient. You control duration, spectral weight, smear, pitch pull, stereo bloom, and impact. Three job recipes establish vocal inhale, dub-chord suction, and cymbal vacuum without hiding the source region or material decisions.
Audition and export use the same deterministic renderer. Identical material state produces identical stereo 44.1 kHz, 16-bit PCM WAV bytes, ready to drag into Ableton. Local audio never leaves the browser.