
Data DJ.
Choose your files. We’ll mix them for you.
Add your files
Full songs and timed data, up to 10 minutes each. Your files stay on this device.
View or change files
Manual controls
Load two audio files to begin.
Outgoing source
Audio stays in this browser. Mono / stereo · up to 10 minutes and 50 MB.
Incoming source
Audio stays in this browser. Mono / stereo · up to 10 minutes and 50 MB.
Give the mix a shared pulse.
Speed changes also change pitch. Key is supplied by you; verify the overlap by ear. Playback and rendering use the same scheduled transition.
Carry the data with the sound.
Attach track-relative numeric data. Each stream keeps its units, source times and missing values. Deck A = 0; deck B = 1.
Add data streams · JSON
No extra data attached.
Make the next choice inspectable.
Optional key and energy annotations describe the music. They do not measure a listener’s emotional response.
Rank a candidate shortlist · JSON
Audio processing happens locally in your browser. No uploads or automatic room broadcasts. Tempo estimates need listening review; variable-tempo music needs a corrected beat grid. This is a two-deck production tool, not yet a stem separator, pitch-preserving time stretcher or multi-device room transport.