From Digitech:

The GNX1™ is much more advanced than the conventional amp modeling processors to date. Thanks to DigiTech’s AudioDNA™ DSP Engine and the software power provided by GeNetX™, the GNX1™ allows the musician to literally create their own amp model, their own speaker cabinet, their own signature sound. The GNX1™ provides several of the most popular amp models and speaker cabinets to choose from and GeNeTX™ provides the tools and technology to “warp” the characteristics of these components together into your own “Hypermodel”. The GNX1’s awesome amp creating ability is also enhanced with a complete library of studio quality guitar effects that made DigiTech famous. The GNX1 also includes DigiTech’s® Learn-A-Lick™ feature, which samples those “speed demon solos” and then slows them down to one-quarter speed while retaining the original pitch. The GNX1’s Rhythm Trainer provides 30 different drum patterns to practice against, a perfect tool for improving your timing. When you put all of this power and technology together in a rugged steel chassis, complete with built-in Expression Pedal, assignable LFO Filters, full MIDI implementation, and a user-friendly interface, and you have the most complete and comprehensive guitar system to date.