Is it possible to edit playback time?

First things first: I have Audacity 2.0.2 running on Windows XP. Now: is it possible to preserve the various elements of an audio file but shorten (i.e., increase playback speed) or lengthen (decrease playback speed) the playback time somehow? I haven’t seen anything that looks like that in the various tools. Thanks.

Have a look at these effects:

The key is “Slightly.” These tools taken to extremes all start sounding funny – like that rapid-fire disclaimer at the end of a medicine commercial. These are the tools you can use if you shot separate sound for your movie and the sound recorder wasn’t completely in sync.