I'm relatively new to mentalism. Just curious what methods do the pros use for extracting information from specs... Impression devices? peaks? pencil/sound/muscle reading? I don't do many mentalism routines (yet), but I like to use Richard Osterlind CT in the ones I do.
Read anything on billets as a start, all of what you have asked to know is in Corinda's work and is worth the price of the book. Invent some, you will feel self achieved and also it will make you appreciate what you actually have in your hands.