I'm thinking at least 11 out of the 15 demos have vocals. I'm specifically talking about Lost, Fighting Myself, More the Victim, A6 (Meteora|20 Demo), Cuidado ("Lying from You" Demo), Husky ("Hit the Floor" Demo), Interrogation ("Easier to Run" Demo), Faint (Meteora|20 Demo), Plaster II / Plaster 2 ("Figure.09" Demo), Shifter ("From the Inside" Demo), and Lost (2002 Mix).