DigiTech's latest, the GNX4 guitar workstation, is an extremely clever box. It combines signal processing, RAM recording, a computer interface, drum machine Buy Digitech Gnx4 Guitar Workstation: The Power User's Guide by Craig Anderton online at Alibris. We have new and used copies available, in 1 editionsDigiTech GNX4 guitar workstation : the power user's guide. Author / Creator: Anderton, Craig. Available as: Physical. Digitech GNX4 guitar workstation : the power user's guide ; Print book : EnglishView all editions and formats · (not yet rated) 0 with reviews - Be the first. Digitech's latest, the GNX4 guitar workstation, is an extremely clever box. It combines signal processing, RAM recording, a computer interface, drum machine