alyjon,
The AUDIO file from the Vocalizer doesn't actually get recorded, just the notes that are played on the keyboard! You can actually record (in a lower volume) the 'vocalizer notes' so that when the vocalizer is turned on and set to MIDI, as you play back the song, the vocalizer harmonizes based upon the notes you played, automatically!!
Let me know if you need any further assistance.
Thanks,
AJ