The reason I don't use Audacity to change the tempo of audio books is because so many of the personal development programs I review include real-time exercises that should be done at 1x speed, and pausing the program isn't ideal. So I need to adjust the playback rate on the fly as I go through each track.
An example would be if the speaker includes a visualization or meditation exercise. Often these aren't separate tracks but are inserted throughout each track. For example, the PhotoReading audio course has real-time guided exercises on almost every CD.
If I was listening to different types of audio books such as fiction, Audacity would be my tool of choice.
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