What?

Extratone is an extreme offshoot of speedcore in which the kick drum is driven so fast (often 600–3,000+ BPM) that successive hits fuse into a continuous tone. Producers shape the kick itself into a pitched oscillator and then "play" melodies and riffs with it. The result is a hyper‑compressed, relentlessly intense wall of sound that blurs rhythm and pitch. Tracks frequently alternate between tonal extratone passages and brief breakdowns, noise bursts, or experimental interludes, emphasizing shock value, sound design virtuosity, and endurance.