How to use this workflow
Open the pitch changer and load audio
Choose a supported mono or stereo file. Leave pitch at 0 semitones if you want to keep the original key.
Set the speed percentage
Set speed between 50% and 150%. The control moves in five-percentage-point steps. Start with a small change and preview the same phrase at each setting.
Generate the changed-speed file
Select Prepare export, then download WAV or MP3. If you adjust the speed again, generate a new result before saving.
Calculate a speed from the BPM you want
Divide the desired BPM by the original BPM, then multiply by 100 for the speed percentage. Changing 100 BPM to 120 BPM requires 120%. Changing 120 BPM to 90 BPM requires 75%. These are calculated examples for a recording with a steady starting tempo.
The current slider does not accept every arbitrary ratio. For 100 → 123 BPM, the desired value is 123%, between the available 120% and 125% steps. Choose the nearest suitable value and check the result; do not expect an exact 123 BPM export from that control.
If the BPM finder reports half-time or double-time candidates, resolve that interpretation before calculating a target. There is no editable original-BPM field on the pitch changer: the displayed BPM is an estimate, while you set speed directly.
Work out the new duration
New duration is approximately source duration divided by the speed multiplier. A three-minute source at 75% becomes four minutes. At 125%, it becomes two minutes and twenty-four seconds. The output is rounded to whole audio frames.
Time stretching can alter attacks and sustained textures. Reducing speed is useful for hearing note sequences, but extreme settings can sound less natural. Evaluate the exported file, not only the displayed duration.
Make a sped-up song version
For a faster version in the same key, leave pitch at 0 and choose a speed above 100%. For a deliberately higher-pitched result, either add a positive semitone shift or use the Sped Up preset in Slowed + Reverb, where pitch follows rate.
These approaches sound different because they do different processing. The right choice depends on whether you want to practice at a new tempo or create a rate-shifted effect. Keep a copy of the original and check permission before distributing an edited recording.
Common questions
Can I enter an exact target BPM?
Not in the current interface. Calculate the percentage, then use the available 5% speed steps. Some exact BPM targets cannot be represented.
Can I make a playback loop here?
There is no dedicated practice-loop control in this workflow. You can trim a passage first, then process that shorter file.