dj-decks — 2-deck stem mixer (music-forge)

DJ DecksUR·135 · 2×4 · htdemucs

Master LIM

Deck A

A ⟷ B

Deck B

Beatmatch — drag a lane to scrub that deck; when synced the downbeats line up under the playhead snap to beat

Library

How the library works

Tracks are separated into stems + analyzed when you add them, then cached for reuse across sessions. Load one onto a deck with →A / →B. Once a deck is playing, the list re-ranks by how well each track mixes into it.

📱 Stems skipped on this device — why?

Stem separation can exhaust phone memory and crash the tab, so it's skipped here. Mixing, cues, EQ and beatmatch still work; turn on Force on mobile in ⚙ Settings to extract stems anyway.

Mix options

Mashup

Acapella-over-instrumental: one deck's vocals over the other deck's bed. Sync + Play both to lock them in time.

Timing quantize pitch-lock sync

Settings

Audio outputs

Master 🎧 Cue

The one-time mic permission only unlocks device labels — the microphone is never used or recorded.

Recording

Format

The container/codec used when you record the master mix. Only formats your browser can record are listed.

Stem separation

Force on mobile

Mobile devices skip stem separation by default — the WebGPU model routinely exhausts phone memory and crashes the tab. You can still mix, cue, EQ and beatmatch; per-stem faders and vocal/instrumental mashups need separation. Enable this to force it (may crash low-memory devices). Applies to newly added tracks.

Keyboard

Click Learn on a control, then press a key to bind it. Shortcuts fire whenever you're not typing in a field; Esc and Tab stay reserved for the interface.

MIDI controller

not connected

Click Learn on a control, then move a knob / press a pad to bind it.