GuitarFX's extremely intuitive user interface delivers Alesis' award-winning DSP technology in the form of 80 preset/user programs, taking guitarists from high-gain distortion mayhem to subtle overdriven sounds, modulation effects, lush reverb and more. Each of GuitarFX's 28-bit effects and amplifier models have been carefully chosen from Alesis' extensive DSP arsenal, and can be completely customized via simple front panel controls. Large increment/decrement pedals and an expression pedal input make GuitarFX perfectly suited for live use, while a built-in auto-chromatic tuner provides for fast tuning on stage; battery or 9VDC operation means GuitarFX is ready to travel. GuitarFX connections include Guitar input, stereo line/headphone output, and expression pedal input. Distortion - Acoustic, Tube Clean, Rhythm, Overdrive, Distortion, Blues, Fuzz, Lead, Metal, Stack Drive, Combo Drive Cabinets - Cab 1, Cab 2, Cab 3 / Processing - EQ, Comp/Limiter Effects - 10 amplifier modeling algorithms, 30 effects, 9 module effects, 8 signal routing options. 80 preset/user programs. Wah, Phaser, Tremolo, Ring Mod, Cry, Step Filter, Slow, Attack, Auto Pan, Auto Phase, Flanger, Rotary, Chorus, Pitch, Doubling, Ping Pong, Tape Delay, Stereo Delay, Echo, Hall, Room, Reverse, Plate, Decimate, Bit Reduce Control & Connections - Top - Effect selector knob, value knob, Increment/decrement/bypass pedals, 2-character LED readout, Audio - 1 guitar in, 1 stereo line/headphone out (1/4 TRS) Other - Expression pedal in (1/4 TRS) Internal DSP - 28-bit resolution / Input and output converters - 20-bit/31.25kHz Frequency response - 20Hz-15kHz +/- 0.5dB. / Signal-to-noise ratio - 80dB (A-weighted). Distortion - 0.06% THD+N Input levels - -15dBV nominal, +3.5dBV maximum Output level - -2dBV maximum Unit Dimensions (H x W x D) - 7.5 x 5.5 x 1.6 inches (190 x 140 x 61mm) / Weight (without batteries) - 15.7 oz.