How to slow down a song on iPhone without changing its key

Prepare the recording

Import a recording you made or an audio file you have permission to use. You can also choose an eligible track from your Apple Music library. That route requires an account and access rights that allow the track to play.

Listen once at normal speed before adjusting anything. A cloud-only file may need time to download. First distinguish loading from a playback failure.

Set a speed and a short A–B loop

Try 75% as a starting point, then lower the speed if you cannot hear the note order clearly. Loopdrill supports 25–200% playback speed. A percentage is a working choice, not a scientifically established best tempo.

Place A just before the phrase and B after its last sound, then enable looping. Start with a passage you can identify by ear. Bar positions are selected manually; the app does not detect musical bars.

Alternate one listening pass with one attempt to sing or play it. If the same mistake returns, shorten the loop before adding more repetitions.

Speed is different from pitch

Speed changes how long playback takes while preserving the key. Pitch changes the key itself. Use speed to hear a fast phrase and pitch to transpose a file to suit your instrument.

Imported files support pitch and EQ. Apple Music playback does not support those adjustments. Very slow playback can alter the sound texture, so check the phrase at the original speed too.

A ten-minute starting routine

Spend two minutes finding the phrase, five working on a short loop, and three reconnecting it at a higher speed. Change this example to suit your difficulty and available time.

Playback, speed control and time-based A–B loops are free. Line-based lyrics practice and sync editing belong to the optional, one-time Lyrics Practice Pro purchase.