Here's how I did it.
I made a CD of the song I wanted the skull (or Skulls) to sing.
I set up my computer with a microphone to record my voice.
I put on headphones and played the CD I made of the song in a walkman into my headphones.
I sang along and recorded my voice singing just the lyrics that the particular skull I was working on would sing.
Then I made a wav file of the track with just my voice. In multi track recording software, (I used Adobe Audition) I matched up (synced up) my voice track with the voice on the real recording.
Then I saved the adjusted file making that a wav file. I had to make sure that it was exactly the same length as the original file and that my voice started at exactly the same number of seconds in as the real track
Then you load up the new track with just your voice and run wavform analysis on it.
After your done with that, save that routine. Then delete the audio track and insert the original.
The jaw now only reacts to the voice part and ignores all the music and other noises, but you hear evertything and if you practice a few times, you will stay in sync the whole way through.
You don't have to be on key or even know every word. As long as you make a sound at the right times at the right volume it will be fine.
I hope that clears it up for you.
There is no other way that is as effective as this.
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