Audio Speed Changer Pro

Audio Speed Changer Pro


(4 stars)


Download for Android

5,000 - 10,000 downloads

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Audio Speed Changer Pro allows you to modify the playback speed or pitch of your audio files "on the fly" (realtime), fitting their audible characteristics to your needs. It can be used to help transcribing audio, to transpose songs, to save time listening to audiobooks/podcasts, to practice dance steps or just to have fun!

How it works: Choose a file, all songs from a folder or a whole album from your personal collection, limit the time frame you want to listen to, set the percentage of speed change you want to apply, set the number of semitones you want to transpose and just press play!

List of features:

- Audio formats supported: mp3, ogg, wav, vox, gsm, aac, m4a, mp4, aif, wma, flac, ac3, mp2, tta.
- Load songs, folders or whole albums (press and hold for options)
- Search songs using the music library or exploring folders and files
- Speed up or slow down audio up to 400% (0.25x - 4x in speed)
- Change pitch from -1 to +1 octave (in semitones or 0.05 semitone steps)
- Export audio as new MP3 or WAV files
- Start and End markers: limit the timeframe you want to listen to by drag&drop or precise setting.
- Song Position marker: set the position you want to start listening to at any time!
- A-B loop and repeat mode
- Plays in background
- Auto saves configuration for each song
- Auto saves song's position for a future session

About permissions (ASC Pro requests 3):

- READ PHONE STATE allows Audio Speed Changer to stop automatically when there's an incoming call.

- WRITE EXTERNAL STORAGE and WRITE INTERNAL STORAGE allow ASC Pro to export the processed audio as new audio files

No personal information is saved, including contacts or phonecalls. Contact me if those permissions bother you.


Developped by Gabriel Simões
Icon by Lucas Reis

* Please report bugs and/or request features by acessing the option "Contact Developer" from the main menu, and not by posting comments on the market. Thank you!

** Before buying this app, try its free version! (Audio Speed Changer)

(time stretching - time stretcher - pitch shifter - pitch shifting)

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Recently changed in this version

- Fixed offline license checking issues
- Fixed audio exporting issues

Comments and ratings for Audio Speed Changer Pro
  • (67 stars)

    by The Fool on 06/12/2013

    For a muso it dosen't get any better than this.

  • (67 stars)

    by Shimious Sanders on 03/12/2013


  • (67 stars)

    by James Cornett on 29/11/2013

    I've been using this app for a while. It looks like the developer took some good sound processing libraries and slapped a UI on top with little thought on asthitics or ease of use. The app frequently refuses to load songs forcing me to remove and reins

  • (67 stars)

    by Brandon Lee on 28/11/2013

    I may need to develop an app much better than this app! won't be difficult considering just one small issue among some large issues is.. every time I press my back button, it exits, the "home page" is nothing but advertisements and the developer is collec

  • (67 stars)

    by mitch meadors on 10/11/2013


  • (67 stars)

    by Julie Law on 16/10/2013

    I have downloaded this app but can't seem to playback the file. Is there a trick to it? . I've rated it average just because I don't want to give a bad rating but I can't properly rate because I can't use it.

  • (67 stars)

    by Shazz Preston on 04/10/2013

    Used this since first came out, but please stop asking for us to validate our license its very annoying, we have bought it end of, I don't always have internet access where I go no other apps I have ask this constantly