Speeding up sound.

Hi, first post! :) I think you´re searching for the pitch shift and / or time shift tool!? Mark the track(s) / part(s), then select "Time Shift" in the "AudioSuite -> Pitch Shift" menue. Here you can easily speed up your selected part.
Hope, this was helpful!
 
You can also Shift+Play, and use AudioHijack or something to record your audio output and then reimport it. Maybe that helps. It's more handy with the scrub tool for that sped up ending on War Pigs or something like it.