It should be easy if you can pitch-shift along a curve. I can't remember if Audacity does this, but it's pretty simple. You just pitch it high first, then as the sound passes you by you pitch it down. Then all you have to do is tweak the curve until it sounds believable. Invariably, you will find yourself saying "neeeie-eaooowowww!!" several times while trying to nail the timing. This is actually the most important part of the process. -- View image here: http://episteme.meincmagazine.com/groupee_common/emoticons/icon_wink.gif --