I can't say what is preferred... I can only tell you how I do it.
My editing software is Soundforge 5. There's an edit function called "resample" (this changes the "bit rate", I believe). If I resample a track, and then copy & paste it to a blank file, the pitch will change. Changing the bit rate to a higher number slows the track - pitching it down, and changing the rate to a lower number speeds up the track.
It was a lot of trial and error to find this out, and to figure what 'increment' change to use to get me close to the desired pitch. Now that I know how to do it, I use a pitch pipe to lock me in to the tonic chord.
For further Z-related fun, please visit http://www.thebignote.com or http://www.killuglyradio.com , thank you.
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