Features 20 Studio Quality Effects, up to 8 at once Built-in drum machine with 30 patterns 40 user, 40 Factory Presets Built-in Chromatic Tuner Expression pedal input for Whammy, Wah and Volume Easy-to-read LED Display Stereo Output doubles as headphone jack Low-noise 24-Bit analog digial converters Runs on batteries or external power supply* 11 Amp Models