This has the firmware update that expands the amps to 12 and more fx options. Features 100-watt, dual-channel 1x12 combo amp (with optional LFS2 footswitch) Catalyst 100 operates like a traditional amp—but provides increased versatility 6 Original Amp Designs—pristine clean to modern high-gain Dedicated Boost and Reverb sections (6 reverb types), 18 Effects (3 types) Power attenuator (half power, 0.5 watts, Mute) for reduced volume XLR line output for pro connection to P.A. or recording devices Effects loop and Power Amp input for integrating external devices MIDI In via DIN connector or USB 4-channel audio interface, MIDI, and Mac®/iOS®/PC/AndroidTM connectivity via USB Free Catalyst Edit app for desktop and mobile devices