(Bass Instruction). A comprehensive source for learning the theory and geometry of the bass fingerboard by one of today s leading players and instructors. Includes: 99 audio examples and exercises hand positions key centers the linear approach and more! Audio features Gary Willis demonstrating 99 examples and exercises. It s accessed online for download or streaming and includes PLAYBACK+ a multi-functional audio player that allows you to slow down audio without changing pitch set loop points change keys and pan left or right.