Audio Speed Changer Pro lets you to speed up audio files without changing the pitch. It is primarily intended for accelerating audio books as well as podcasts, but can be surely used with any other sound track or file. The batch processing feature and convenient user interface make Audio Speed Changer Pro a valuable tool for book listeners and authors who want to save time.
Here is the list of key features which prove that Audio Speed Changer Pro is unrivalled and irreplaceable solution for speed-listening to audio:
- Handles the MP3, OGG, WMA, WAV, and AAC/MP4/M4A/M4B file formats as input.
- The program is able to work in a batch mode. You can specify different tempo changing, pitch shifting, and the playback rate multiplier for separate files in the list.
- Previewing of changes before final conversion.
- Supports configurable output to the MP3, OGG, PCM/WAV, and AAC/MP4 file formats — converted audio will be available for speed listening on your personal computer, Smartphone, iPod, and any portable MP3 player.
- Individual tag editing.
- The downmixing to mono feature.
- An ability to normalize volume level of all output files.
- The software can be integrated into the Windows Explorer shell for quick access to its major functions.
- The portable version of Audio Speed Changer Pro is available.
- Works on all NT-based operating systems, from Microsoft Windows 2000 and XP, up to Windows Vista and 7, including x64 editions.
Download Free Trial
You can download an evaluation version of Audio Speed Changer Pro and try it for 30 days.
Audio Speed Changer Pro is Shareware. This means that it must be purchased before all benefits of the software will become available.
A single user license costs $19.95. It allows you to install Audio Speed Changer Pro on 2 computers (e.g. on a laptop and a desktop) for usage by one person. Please follow this link to proceed to the order form:
The bundles and suites including Audio Speed Changer Pro are available here. If you need a custom license for more users, or a site license for a company, please contact us and we’ll get back to you with an advantageous offer as soon as possible.
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New features marked with a plus symbol (+), and improvements with an exclamation mark (!).
1.5 (September 27, 2012)
[+] Added full support for the Windows Media Audio (WMA) file format as input.
[+] From now on, the overall conversion progress is displayed on the Windows 7/8 task bar.
[+] Tested against the Ubuntu GNU/Linux Desktop 12.04 AMD64 + Wine 1.4 final — no issues or flaws spotted.
[!] Upgraded the used list control.
[!] Improved handling of WMA- and AAC-encoded audio files on Windows Vista and 7.
[!] Confirmed compatibility with the Windows 8 Release Preview.
[!] Upgraded the utilized audio libraries.
[!] A couple of internal fixes.
1.4 (January 15, 2012)
[+] Added the command line interface. See the readme file for syntax details.
[+] The app is now digitally signed.
[+] Ensured compatibility with the developer preview of Windows 8.
[!] The Add Directory command: remembering of the most recent used path.
[!] Enhanced playing back and rewinding of extra-short tracks.
[!] Fixed a possible leak of strings of the main list control.
[!] All the used audio libraries are now up to date.
[!] Updated the library for reading ID3v2 tags.
[!] Updated the setup script to assign comments to the created shortcuts.
[!] UI: a few grammar corrections.
[!] Various small improvements.
1.3 (December 17, 2010)
[+] Output to uncompressed PCM/WAV file added.
[+] New program settings: Sequence Length, Seek Window, and Overlap Length.
[!] Added website links into the Help menu.
[!] Updated the internal audio playback library.
[!] Some minor enhancements.
1.2 (September 25, 2010)
[+] Now there is a total file counter on the status bar.
[+] Added the Add Directory item into the file list popup menu.
[!] Now Audio Speed Changer Pro displays progress when normalizing volume.
[!] Updated the internal audio effects library.
[!] A lot of internal enhancements in the program code.
[!] Corrected some typos in the readme.
1.1 (July 26, 2010)
[+] Added an option for preserving directory structure if source files are from the same parent directory.
[+] Ability to add all supported files from a certain folder (check out the new Edit -> Add Directory menu item).
[+] Added the “Updating the Product” paragraph into the readme documentation.
[!] Enhanced diagnosing if initialization of the audio subsystem fails.
[!] Now the Comment field is multiline (was single-line).
[!] Updated the internal encoding subsystem.
[!] Enhanced UI of the browsing for destination folder dialog window.
[!] Added version information into the product installer.
1.0 (March 26, 2010)
The first public release of Audio Speed Changer Pro.
Here are the awards that our batch tempo/pitch/playback rate changer received since releasing the very first version in 2010:
If you want to read comments and testimonials to Audio Speed Changer Pro, or to write your own, then please follow to this separate page.