Hey, man. Just use the DSP Transpose process in the Global menus in Sonar (select the clip > Process > Transpose then adjust it in the dialog window). It works really well and let's you transpose in semitone increments. That's what I used to transpose that stereo wave. It works way better on single tracks.
But Melodyne is really good too.
Cheers.
Edit: You probably already knew that though but it still works well. The nice thing about Melodyne though is you can use it to create in key harmonies like thirds and fifths. The Transpose process cannot do that... well not as easily.