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Audio Speed Changer Pro is Windows software intended for adjusting playback speed, tempo, and pitch of audio books and podcasts--for the most comfortable listening to them. Supported audio formats include MP3, WMA, OGG, WAV, and AAC-encoded files such as M4A, M4B, and MP4. The program is able to work with batches and you can preview result before final conversion. SuperUtils' ASCP is a $20 shareware product, 30-day trial is freely available on the vendor's website.
