Your track
One track, read and swapped. Sonic splits it into drums, bass, melody and voice and reads it against every released record it knows; then any part can be swapped for the licensed loop nearest yours, or nearest an artist, a scene or a spot on the map, heard in your track, and the whole thing downloaded.
Your track goes to Sonic’s worker to be split, read and measured, and is not kept. The reading takes about a minute, the split one to three. Privacy
From the full reading, at the foot of the page.
Sonic is unsure where this track’s beats fall: its kicks and snares do not land on a steady grid. A swapped part may sit off the beat here.
A scene as the Listen map draws it: the average of its separated records’ same part.
Across
Up
The Listen map, the same records on the same measures. Tap a spot: Swap points at the twenty-five records nearest it.
Each part as its own MP3 as laid, before the loudness match and limiter, all lowered by one gain so they sum to the mix with headroom; the lines Sonic read from your parts as MIDI files (a note or a kick and a snare per sixteenth); and a text recipe: every loop, its bars and credit, the share of yours kept, levels, moves and the feel.
This section, one part (WAV)
This section’s parts as WAV stems, one at a time, as they sit in the swapped mix.
Your lines (MIDI)
The lines Sonic read from your own parts, from the first bar line, as MIDI: measured, not the loops’.
The same track read in full: its middle minute measured as every released record was, placed among them, part by part.
How it is made
Measured from your track: the parts (split by the same separation as every record Sonic reads, so each part keeps a little of the others), the tempo, where each bar starts, and each part’s level bar by bar.
Licensed, not measured: every swapped sound is an openly licensed loop from Freesound (CC0 or CC BY). Nearest means nearest your own part in Sonic’s measures of sound. A target is what the rest of Sonic points at: an artist (the average of their separated records’ same part), a scene as the Listen map draws it (the average of its records there), a label (the average of its separated records), a DJ (the average of the separated records they have played in published tracklists, from MixesDB), one record, or a spot on the map (the average of the twenty-five records nearest it, on the two measures shown). Under a scene, the artists Swap can point at are listed by how many of their records were in its Beatport top 100 across the weekly charts Sonic has kept (from 31 August 2026; rebuilt daily). Close in sound is not the same as right for your track.
Placed by rule: the loop is stretched to your tempo with Rubber Band, moved to your key for bass, melody and voice, starts on your bar lines, and plays only in the bars where your part plays, at your part’s level there. With Your notes on, the loop is re-pitched sixteenth by sixteenth to the line Sonic read from your part (pyin between level rises, the note of a run’s loudest frames), in the loop’s own register; for drums, the loop’s kick and snare are laid on the kicks and snares read from yours, under its own top. Sections are runs of bars where the same parts play at about the same level; phrases are the eight-bar count the most section changes fall on. A cut silences the last beat of a phrase; a roll fills it from the loop’s own first sixteenth. The whole-track download is matched to your track’s loudness (EBU R128) and limited at -2 dBFS; the section download is not.
Hearing it: Your track / Swapped plays the whole track either way; a part’s Hear row (Yours, Theirs, Both) mutes the other parts so the stem and the loop can be compared on their own, in the same bars, and skips the bars where the sound heard rests (a loop sounds only where your part plays). A tap on any of these plays at once. Listening choices change nothing in the download.
No sound comes from another artist’s record. If you release a track with a CC BY loop in it, credit it as listed above.