DigiTech's latest, the GNX4 guitar workstation, is an extremely clever box. It combines signal processing, RAM recording, a computer interface, drum machine, MP3/MIDI sequence playback, a MIDI interface, and more.in fact, maybe it's a bit too clever because it can be hard to wrap your head around all the ways in which these bits work together. Hence this book. There are a lot of cool features just "below the surface," and they're relatively easy to miss without the guidance of a pro, like author Craig Anderton. He'll show you how to get the most out of your guitar workstation.