The "G1 FOUR" incorporates over 70 amp/effect models and allows the simultaneous use of up to 5 effects in any order. It comes standard with 13 amp models that faithfully emulate the internal circuits of real amps, cabinet models using advanced IR (Impulse Response) technology, and over 60 guitar effects including models of famous boutique pedals. Furthermore, you can download additional amp models, effects, and patches distributed from the PC/Mac application "Guitar Lab" and install them on the unit for free. It also features a looper function, rhythm machine function, tuner function, headphone jack, and an AUX IN jack for connecting a music player, making it suitable for all situations from daily practice to live stages. Manufacturer...ZOOM