Do you know what tempo the Wav loop files are?
If so, you.can either use the Time and Pitch Machine or the Flex Time.
1. Drag your audio into the Arrange WIndow. Double click it to bring up the Sample Editor window. Then go to [b]Factory[/b] > [b]Time and Pitch machine[/b]. Here you can convert the tempo of the audio. Set the [b]Original[/b] to the original tempo (if you know it) and then under [b]Destination[/b] add the new tempo. Under [b]Algorithm[/b] you can change the type of algorithm conversion to use. It will depend on the type of audio. [b]Universal[/b] seems to work quite well on different types of audio.
2. The other option is to use [b]Flex Time[/b]. Drag the audio file into the Arrange Window. Then hold the handle of the audio file+Alt, and drag the audio to reduce or increase it in comparison to your projects tempo/grid.
Hope this makes sense. Let us know if you come right.