[packjaddison]

Astoundingly, I have never heard another source advise doing this, and this includes professors at Juilliard. I don't work on all my pieces using pure Mental Play as frequently as I should, but trying to 'play on phantom limbs' without being at the instrument is like trying to remember the exact details of a painting you have looked at. Though there are many parts of the book that are a bit more... cranked.