Mm - hmm. Mm - hmm.
And so this is saying , well , if you really do have that  sort of vocal tract envelope , and you subtract that off , what you get is the excitation. And I call that lies because you don't really have that , you just have some kind of  signal - processing trickery to get something that 's kind of smooth. It 's not really what 's happening in the vocal tract
Yeah.
so you 're not really getting the vocal excitation.