Adjust Tempo of MP3

4. Adjusting playback-speed with software on a computer:

If you want to play the music with your music library on your computer, you can use software on your computer.

Windows Media Player (Windows):

With Windows Media Player you can easily adjust the playback speed.
Unfortunately, this option is quite hidden in the menu.

  • Open Windows Media Player.
    In Windows 10 you can find “Windows Media Player” via search (magnifying glass).
    Pin it down to your taskbar so you can find it easily.
  • Start playing a track
  • Windows Media Player opens standard in the music library.
    Switch to the “Now Playing” mode:

Bottom right is an icon (see the picture above).
Click on it so the Now Playing window appears.

  • Right click on an empty spot in the Now Playing window.
  • Choose from the “Settings menu / Play Speed ​​Settings”
    (“Enhancements / Play Speed Settings”)
  • Move the slider (1.0 = normal) or click on “Slow”, “Normal”, or “Fast”

Quicktime Player 7 (Mac):

For MacOS we recommend Quicktime Player 7 which you can install alongside the normal Quicktime (10) and iTunes.
(In the new QuickTime Player unfortunately this feature is not supported anymore)

Please first install Quicktime Player 7 via the above link.

If you use iTunes (Mac) for playing the accompaniment music:

  • Go in iTunes to the desired track
  • Right-click on the appropriate track
  • Choose: Show in Finder
  • Right-click on the audio file
  • Choose: Open with / Quicktime Player 7
  • The file has been opened in Quicktime Player 7, follow the steps below

Open the file in Quicktime Player 7 if you have not already done so:

  • Go to Window / Show A/V Controls
  • Below Playback Speed: Move the slider

BestPractice (Windows):

An old programm which unfortunately only works on Windows 10 via compatibility mode (see below).
In Windows 7 and older the program works without modifications.
I still add it here because this programm can directly adjust the tempo from the CD!

BestPractice: An open-source audio time-stretching tool
BestPractice is a musician’s practice tool, to slow down or speed up music, either from an MP3 file or directly from a CD. Ordinarily the sound is distorted when slowed down our speed up – you get the effect like when playing a 33 rpm record on 45 rpm speed (remember the Chipmunks?). BestPractice tries to correct this, so you can slow down and speed up music, while keeping the original pitch. It is also possible to change the pitch of the music without affecting its tempo. Play along with for instance Eb tuned guitars without retuning your own, or slow down that high-speed guitar solo on a CD that you like to learn.

In Windows 10 you can go setup compatibility mode as follows:

  • Right-click on the program icon or file in Windows Explorer.
  • Choose Properties
  • Select Compatibility tab
  • Select “Compatibility mode: Windows Vista Service Pack 2”.

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