600 Over!!

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.

Splittercore is an ultra-extreme offshoot of speedcore characterized by blistering tempos—typically 500–1000+ BPM—and relentlessly clipped, staccato kick drums that sound like rapid-fire bursts. The name reflects the signature “split” feeling of ultra-short, overdriven kicks that carve through the mix like shards. Tracks are usually short, brutally loud, and intentionally abrasive, favoring distortion, bitcrushing, and hard clipping over conventional dynamics. Rhythms are programmed at microscopic subdivisions (1/64–1/256 notes and beyond), often with glitchy fills, sudden start–stop edits, and occasional breakcore-style sample splices. Melodic content, when present, tends to be simple rave stabs, shrill leads, or horror/industrial atmospheres, deployed as punctuation between kick barrages. Culturally, splittercore grew from the gabber/speedcore party circuit and DIY netlabel ecosystems, later flourishing online via forums, trackers, and sharing platforms. It sits on the continuum between terrorcore and extratone, pushing speedcore’s velocity to its percussive limit while remaining kick-defined (unlike extratone’s tonal blur).