If you don't care about adhering to a tempo, you can adjust the length of a sound. On the "Sound" tab, click the option to "Time Stretch By". Now choose a value from 25% to 400%.
This can be useful for the following operations:
•Fitting a sound effect in a longer or shorter time.
•Syncing a sound to fit a video
•Shortening a liability narration at the end of an audio ad. ;)
•Lengthening a sound to hide any silence gaps.
You can visually time stretch a sound by using FlexAudio ™.