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How to Change Audio Speed

Aug 04, 2020• Proven solutions

If you have a music file, and you notice that it is a bit slow or fast that is making the entire ambiance kind of dull or overly exciting respectively, you can change audio speed to get the track right as per your mood. However, when you make any such adjustments, most of the time there are some unwanted effects that can be experienced, such as format limitations while exporting, changes in the pitch of the sound, etc.

That said, here you will learn how to change audio speed with least adverse effects using some of the most popular and highly recommended tools.

How to Change Audio Speed in Filmora9

Being a lightweight and less resource-intensive post-production tool, Filmora9 is admired by several professionals across the globe, and is many times preferred over other editing programs like Adobe Premiere Pro and Final Cut Pro X. Easy-to-understand UI and large-sized, clearly visible options and buttons are what make Filmora9 extremely popular among those who are new to the industry, and don’t have a computer with a powerful processor, gigantic memory, and enormous GPU.

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You can follow the steps given below to learn how to change audio speed with Wondershare Filmora9:

Step 1: Import Audio and Add to Filmora9 Timeline

Launch Filmora9 on your Windows or Mac computer, make sure that the Media icon is selected from the standard toolbar at the top, click the + icon in the Media (also referred to as Library here) window (on Mac) or anywhere in the Media window itself (on Windows) from the upper-left corner of the interface, and import the audio file that you want to manage the playback speed of. Next, drag the media file from the Library to the timeline.

 add audio to timeline Filmora9

Step 2: Increase or Decrease Audio Speed

Ensure that the audio track is selected in the timeline, click the Speedometer icon from the timeline toolbar at the upper section, hover mouse to the Slow option from the menu, and click your preferred value form the submenu to reduce the sound speed. Likewise, hover the mouse to the Fast option, and choose a value from the submenu to increase it.

 adjust audio speed in Filmora9

Note: Usually the pitch of the audio wouldn’t change as long as you pick the values anywhere between 0.5x and 5x. However, if you select any option beyond this range, you may experience variations in the pitch according the value you selected.

Step 3: Set Custom Speed or Reverse the Audio

Click the Speedometer icon from above the timeline, and click Custom Speed from the menu. On the Custom Speed box, use the slider to decrease (move to the left) or increase (move to the right) the audio speed. Alternatively, you can manually enter your preferred value in the available field for granular control. In addition, you can also check the Reverse Speed box to reverse the audio if need be.

 adjust audio speed in Filmora9

Step 4: Export the Output

Click EXPORT from the top-center area of the interface, go to the Local tab on the Export box that opens next, select your preferred audio format from the Format list in the left, make necessary customizations from the right pane, and click EXPORT from the bottom-right corner of the box to export the audio with the modified speed.

 adjust audio speed in Filmora9 - export

How to Change the Speed of Audio with Video in Filmora9

The process to change audio speed that also has a video is identical to what is explained in the previous section. The only additional step that is required in this case is separation of the audio track from that of video.

You can learn how to get this done by following the instructions given below:

Step 1: Import File to Media Window and then Add to Timeline

Use the method explained in Step 1 of the previous section to import a file to Filmora9, drag the media to the timeline, and click MATCH TO MEDIA when the Project Setting box appears and prompts for confirmation. Note: Except for the Project Setting box, the rest of the process for adding both audio and video files to the timeline is exactly the same.

Step 2: Separate Audio from Video

Select and then right-click the video track with audio in the timeline, and click Detach Audio from the context menu.

 detach audio from video in Filmora9

Step 3: Adjust the Audio Speed

After the audio is detached, you can select the audio track, and follow the method explained in the previous section to adjust its speed as needed. As for the video, you can use the trimming and cropping options to adjust its duration and size, and then export the entire project as explained in Step 4 of the previous section. Note: To export the project as video, all you need to do is, choose a video format like MP4 or something similar to that when on the Export box.

How to Change Audio Speed without Changing Pitch in Audacity for Free

One of the most downloaded, used, and admired applications, Audacity, is an opensource and free audio editing software available for Windows, Mac, and Linux computers in both x32 and x64 variants. The software has all the tools that the professionals require for basic to advanced sound editing in order to produce industry-standard outputs.

You can follow the steps given below to learn how to change audio speed with Audacity without changing the pitch of the sound:

    1. Launch Audacity
    2. Click File
    3. Go to Import > Audio

 change audio speed  in Audacity

    1. Import the audio you want to change the speed of
    2. Press Ctrl + A on the keyboard to select the whole audio track
    3. Go to the Effect menu
    4. Click Change Tempo

 change audio speed  in Audacity

    1. In the Percent Change field, enter a value with or without minus (-) to reduce or increase the tempo of the audio respectively

 change audio speed  in Audacity

  1. Click OK
  2. Go to File > Export
  3. Select your preferred option from the submenu to export the modified audio as needed

Note: Changing the tempo usually doesn’t change the pitch of the audio up to some extent. However, you can expect some variations in the pitch if the new tempo value is too high or too low.

Conclusion

You may want to change audio speed if the existing one is not up to the mark, and you wish to manage the ambiance with the help of the music track either while playing a video, or when merely a soundtrack is to be played during some event. In either case, the best tool for all your needs is Wondershare Filmora9, and if you are looking for a program that is dedicated to audio only, Audacity is something worth trying.

Liza Brown
Liza Brown is a writer and a lover of all things video.