Hey KFingers, Tony and 124
Thank you for your kind words!
KFingers, you should take a look at the VL2. In addition to doing harmonies, it also tweaks the sound of your voice and optimizes it for live situations. It has an auto-sensing algorithm that adjusts compression and other parameters according to how you're singing.
124 and Tony, with regards to the Christmas song, being inebriated helped a lot!