The audio harmony feature in BIAB is really cool but no matter what I do they always sound metallic and sterile. I'm not a bad singer but I have a devil of a time adding my own harmonies because I want to keep straying back to the melody. Here's what I do now; I go ahead and create the harmonies with the Auto feature and save them as seperate wave files, load the melody track and the harmony tracks in RB,after each harmony track I insert a new audio track then I mute all but one of the harmony tracks and then arm the audio track I created for it, after a few practice runs singing along in unison with the Auto created harmony, hit record. Do this for each part then delete the Auto tracks and voila!, you have great natural harmonies. I've even created my own Gospel quartet this way. You don't need to have a great vocal range to do it either...try it and you'll be surprised how great it sounds