Try the audio plugin “pitch shift”. On the left of your screen, in the track header, click the green icon to bring up the track effects window. Click the same green icon in the new window (upper right). Find “pitch shift” and click Add, the click OK. Now you’ll get an effects control window. Easiest thing to do from here is use the drop down box and select either “fifth up” or “third up”. Try them both to see which you like. Once you’ve decided, click the red X in upper right to close that window.
steven