REH Book/ Audio Pack Improve your speed and fluidity through increased pick efficiency. Gambale explains and demonstrates sweep arpeggios, speed picking licks, harmonic superimpositions, sequence licks, and more! The audio is accessed online using the unique code inside each book and can be streamed or downloaded. The audio files include 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.