Hear a different sound in the song you are making.
A promising loop may be too fast or in a different key. Try with my song changes the second sound’s speed and musical key to help you hear how it might sit beside your song. Your reference recording stays as it is.
Working preview · Vault is currently in private testing. Public plans are not on sale yet.
Updated November 14, 2026 · Written by Selekt AudioWatch the loop change, then listen to both versions
We use a real music excerpt and a slower browser-made version to demonstrate a speed difference. Only the second sound changes. You can replay the guide or explore the controls yourself.
Preview only. No account files, payments or cloud saves. Music loads when a demonstration needs it—not when you open this page.
Three steps to get started
- 1Choose your reference song, or enter its known speed and key.
- 2Choose the loop or recording you want to adjust.
- 3Preview the change, compare both in context and keep a separate fitted sound.
First, choose the song you want the sound to go with
Search and select the recording you are working on. We use its speed, measured in beats per minute, and musical key as the guide. The reference itself is not changed.
The tool can estimate missing details when supported, but estimates are not always confident. Check them and enter what you know. You can also enter a known speed and key without a reference recording, although you need both recordings to hear them together.
Then choose the sound you want to change
Search and select the loop or recording to adjust. The tool compares its known details with your song. Changing tempo stretches time; shifting key changes pitch. Those are separate decisions.
Leave pitch alone for a drum or noise recording that has no musical key. Unknown speed or key stays unchanged. An unreadable key should show a visible error before fitting; a minor-to-major difference needs an explanation because moving pitch does not rewrite the notes into a different mode.
Listen on its own, then listen alongside your song
Preview a short section first. Compare original and adjusted audio, then play either alongside the reference using shared playback, seek, separate volume controls and a reference starting point.
Both recordings start together at the chosen reference point. This does not automatically align downbeats, vocals or phrases. Moving to another section or changing the starting point can help you judge the idea more fairly.
Keep the fitted sound without changing your original
If the comparison works for your idea, download the adjusted WAV or review saving it as a new file. The original stays unchanged and the fitted copy records its own treatment.
Saving keeps only the adjusted sound. It does not save the two-file listening mix. To arrange or combine sounds into a finished mix, use the appropriate full creative dashboard and review its options.
Start small and choose with your ears
The browser preview supports up to 60 seconds from eligible mono or stereo audio up to 50 MB and five minutes long, with a known duration. Larger changes can sound less natural, so compare the detail as well as the overall feel.
The current preview uses no processing credits. Downloading a local preview and saving a retained Vault copy are different actions. In this demonstration, all changes stay in this browser and no account storage is used.
Give your next step a useful starting point
Opening a tool does not start paid processing. Review its capabilities, options and price first. Saving an available result is a separate choice.
Questions you might have
Does matching key and BPM guarantee a musical fit?
No. It gives you a starting point. The notes, rhythm, phrasing and arrangement may still differ. Listen to the recordings together before deciding.
Which recording changes?
Only the second sound—the loop or recording you choose to adjust. Your reference song and original source remain unchanged.
Can I save both sounds as a finished mix?
This comparison saves only the adjusted sound, not the combined listening mix. Use a mixing or arrangement tool for a finished combination.
Can this turn a minor melody into a major melody?
A simple pitch shift changes the root pitch while retaining the musical mode. It does not rewrite a minor melody into major.
