Val,

When using the TC Helicon for harmonies; (I assume that is what you used?), be sure to not have any effects enabled or recorded on the vocal track the TC uses to create the harmonies with. You will get unwanted artifacts added in the rendering of the harmony tracks.

I have found if I use a dry, mono vocal track, the rendering of the harmonies come out much cleaner and clear sounding. I also prefer using "chords" setting for the TC's guide. Once you have rendered your harmonies, start with using the "background singer" category for the track effects. You can then open the mixer and adjust each dx-effect parameter for desired results.

Trax