Change Tempo - Audacity Manual

# Change Tempo

### From Audacity Manual

Use the Change Tempo effect to change the tempo of a track without changing its pitch.

  Accessed by: Effect > Change Tempo...

Note: all the input boxes are linked: changing the value in one box will change the values in the others.

## Percent Change

If you know the amount you want to change the tempo of the selection, enter that value in the input box. You can also drag the slider to select a value: the input box will update as you drag the slider.

## Beats per Minute (BPM)

If you know the BPM of the selection and the BPM you want to change it to, enter those values here.

## Length

If you know what you would like the new length of the selection to be, enter that value in the to input box. The from box shows the current length of the selection and cannot be changed. This is useful if you have a piece of narration that is just a little bit too long or too short to fit where you want it.

## Limitations

Change Tempo is a time stretching effect, because it defies the normal expectation that reducing the speed of the audio (thus increasing its length) will reduce the pitch and vice-versa. Some artifacts will be expected at more extreme settings.

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