Load a song and drag the speed down to hear every note. The pitch stays exactly where it was, so you can play along. Loop the tricky bar and nudge the tempo back up as it gets easier.
How it works
Drag in an MP3 or other audio file. It plays straight from your device — nothing is uploaded and nothing is saved.
Drag the speed to 50–75% so you can hear every note; the pitch does not move. Turn on the A–B loop and drag the two handles around the bar you are working on.
Play the loop until it is clean, then raise the speed a notch — or switch on auto step-up and it adds 5% every pass until you are back at full speed.
Who uses it
Five situations where slowing the music down is the fastest way to learn it.
The situation: A guitar solo goes by too quickly to work out the notes.
What they do: Drop the speed to 40%, loop four bars at a time, and copy the phrasing note for note.
The result: The solo becomes learnable instead of a blur.
The situation: A drum fill keeps falling apart at tempo.
What they do: Loop the fill at 60%, get it clean, then use auto step-up to creep back to full speed.
The result: The fill locks in because the hands learned it slowly first.
The situation: You are transcribing a bassline and the low notes are hard to pin down.
What they do: Slow the track to 50%, loop one phrase, and notate it a few notes at a time.
The result: A clean transcription without endless rewinding.
The situation: A routine has a fast section the group cannot keep up with.
What they do: Rehearse that section at 70% until the counts are solid, then bring it up to speed.
The result: Everyone hits the moves together at full tempo.
The situation: A student can play a piece slowly but rushes and stumbles at the marked tempo.
What they do: Loop the shaky bars just above their comfortable speed and step up gradually through the week.
The result: The piece is steady at tempo by the next lesson.
FAQ
Yes. The player uses your browser's built-in time-stretching, so a song at 50% speed sounds an octave lower only if you turn that feature off — here it stays in the original key.
No. The audio plays directly from your device. Nothing is sent to a server, saved, or shared.
From 25% up to 150%. Most practice happens between 40% and 90%; the faster-than-normal range is handy for testing whether you can push a passage.
Turn on A–B loop, then drag the two handles on the progress bar to the start and end of the section you want to repeat. The player loops between them until you turn it off.
Each time the loop repeats it raises the speed by 5%, up to 100%. It is the classic way to take a passage from slow and clean to full tempo without thinking about it.
Time-stretching adds a slight watery texture, more noticeable below about 40%. It is still perfectly clear enough to hear pitches and rhythm.
Not in this tool — it only changes speed while keeping the original pitch. Use a dedicated pitch-shifter if you need to transpose.
No, it needs an audio file. Download the audio you have the right to use, then load it here.
Yes, in a modern mobile browser. Load the file, and the speed slider and loop handles work with touch.
Yes, completely, with no account and no limit on how long you practise.