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The Transpose tool is a scratchpad. Nothing you drop into it is added to your media library or written to your Google Drive folder — files are processed on demand, downloaded to your device, and deleted from the server a few hours later.
The Transpose tool at lightloop.app/transpose gives you the Song Editor’s audio processing on its own, for any track — not just songs in your library. Use it when you need a key change or a backing track for something outside LightLoop: a rehearsal file, a track for another app, or a one-off for a guest musician. It’s the same engine behind song transposition and instrumentals, so results match what you’d get in the editor. Sign in with the Google account you use for LightLoop — the tool is behind your normal login.

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Adding audio

Two ways in:
  • Drop a file — drag an audio file onto the page, or click to browse. MP3, M4A, WAV, AIFF, FLAC and most video files work; audio is pulled out of a video automatically.
  • Paste a YouTube link — paste the URL and click Fetch audio. LightLoop downloads the video’s audio track. (Nothing is added to your library — this is separate from the YouTube import in the Media Library.)
Once the audio is in, LightLoop reads it and detects the musical key, then shows a player so you can hear the track and check that key by ear before committing to anything. Each step reports its own progress — uploading, reading the file, detecting the key.
Key detection is a best guess from the audio. If it can’t make a confident call, the From field is flagged set this yourself — play the track, work out the key, and pick it manually.

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Choosing the key

Set the From key (pre-filled with the detected key) and the To key. LightLoop shows the shift in semitones and always takes the shortest path — up to six semitones in either direction. Pitch shifting preserves the original tempo. The song doesn’t get faster or slower, only higher or lower. Leaving both keys the same is fine — pick an extra below and you’ll still get a file out.

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Extras

Three options, one at a time: Extras are always applied after the pitch shift, so stems and instrumentals come out in the key you asked for.
Stem separation quality depends on the model installed on your LightLoop media server. With a multi-stem model available you get four parts plus an instrumental; otherwise it falls back to a two-part split (vocals and instrumental). The Ready panel tells you how many parts you actually got.

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Generating and downloading

Click Generate. Each stage reports progress — decoding, shifting, separating, encoding — and separation shows a countdown based on how long previous runs took on your server, so you know roughly how long to wait. When it finishes:
  • Every file is listed with its size and its own Download button.
  • If there’s more than one, a Download all button at the top hands you everything in a single zip.
Files stay on the server for a few hours and are then deleted automatically. Start over clears the session immediately.

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What it doesn’t do

The Transpose tool is deliberately separate from your library:
  • Nothing appears in your Media Library, and nothing is written to your Google Drive folder.
  • It has no lyrics, timing markers or slides — for that, work in the Song Editor, where transposition and instrumentals are attached to the song and play on your outputs.
If you want the transposed track in LightLoop, upload the downloaded file to your Media Library as normal, or transpose the song directly in the editor instead.