In-browser stem DJ mixer · CAT# UR·135
A full two-deck booth that pulls every track apart into drums, bass, melody and vocals — right in your browser. Beatmatch, key-match, drop an acapella over another track's instrumental, and record the set.
What it does
Stem separation runs on your GPU the moment you add a track — then it's yours to isolate, mute, mash, and mix.
htdemucs splits each track into drums, bass, melody and vocals. Solo or mute any stem, or lay one deck's acapella over the other's instrumental.
Every track is analyzed for BPM, musical key (Camelot) and time signature. Load one deck and the library re-ranks by what mixes best — same key, adjacent key, closest tempo.
Octave-aware sync (80 ↔ 160 just works), snap-to-beat on the beat grid, and a sync-jog that shuttles both decks forward or back while staying phase-locked.
Hot cues, beat loops and rolls, beat-jump, 3-band EQ + filter, fine tempo trim, type-in BPM, and key-shift to transpose a track into a compatible key.
Record the master mix — crossfades, EQ, mashups and all — straight to a file you can download.
Minimal-techno white-label, a VHS mixtape, or a photocopied rave flyer — each in light and dark. Purely cosmetic, instantly switchable.
Private by design
There's no server. Tracks are separated once with WebGPU, then cached in your browser for instant reuse next session. Your music never leaves your computer.