I have a file I recorded from a 4-track tape deck that recorded the audio at double tape speed i.e. it plays back at half speed. I want to take that MP3 file and make it twice as fast. This seemingly trivial thing seems impossible to accomplish. I open it in soundtrack pro (I don't have much experience with it) and the clip speed options are grayed out. There are options to change the pitch without changing the speed, and change the speed without changing the pitch, but this all seems too complicated. How do I just make it go twice as fast?