Rattlecut is a tiny percussion instrument for producers who need the last beat of a drum-and-bass bar to become airborne debris. It generates a deterministic 32-cell pattern at 174 BPM, synthesizes each hit in the browser, and exports the result as a mono 48 kHz, 16-bit PCM WAV ready to drag into Ableton.
The seed fixes the rhythm and timbral variation. Density decides how many of the 32 cells fire. Drag pulls alternate hits late while extending their decay, turning rigid subdivisions into a collapsing roll. Metal shifts the resonant partials from blunt hardware toward bright, inharmonic shrapnel. Every control changes the actual synthesis, not a decorative readout.
The circular rotor makes the fill legible without falling into waveform-wallpaper nonsense. Hit positions sit around the machined ring, late-bar impacts push outward, and the playhead makes one physical revolution during audition. The controls stay compressed beneath the object so the instrument remains playable on a phone instead of becoming a desktop rack crushed into a narrow column.
There is no sample library and no server. Rattlecut builds the same audio from the same recipe locally, normalizes the render, writes the WAV header by hand, and downloads the finished resample. Roll until the rhythm bites, shape three parameters, strike it, export it, move on.