Discover the true potential of advanced stereo tremolo, the Source Audio One Series Vertigo delivers a divine renewal of vintage "opto trem," the haunting sway of Harmonic Tremolo, and a sweetly overdriven Bias Tremolo.EEEEEEEEEEEEEE Classic delivers a divine renewal of the thumping Oopto tremO amplitude modulation found in many vintage Fender amps. Harmonic Tremolo revives the haunting sway of some of the Fender SuperOs OVibratoO effects from the early 60s. Harmonic Tremolo ping-pongs between two filters - one with a low frequency bump and another with a high frequency bump - creating a swinging, swirling phaser-ish effect. Finally, a sweetly overdriven Bias tremolo creates the Obias wiggleO of many early tube bias modulation amplifier effects.But it doesnOt end there... the Vertigo takes the tonal flexibility a step further with its Shape knob. The Shape knob allows users to morph the LFO wave shape from opto trem, to sine, to square, to saw tooth. Plus, if three tremolo types are not enough, explore the VertigoOs Neuro Effect Editing software (for Mac or Windows) or Neuro Mobile App. (for Android or iOS) and access a mind-bending collection additional tremolo effects including Tilt-A-Whirl Flanger (a tremolo/flanger combination), Interstellar Sequencer (a sequenced square wave filter/tremolo combo) and Trance Tremolo (an alternative tremolo rhythm). Upload any of these effects to one of the pedalOs three mode switch locations.The Vertigo Tremolo is also fully MIDI compatible when connected to the Source Audio Hub. Save up to 128 pedal presets, easily recalled via any brand of MIDI foot controller.Specifications: Diverse Sound Palette N Choose from 3 onboard effects with the center mode switch. Simple and intuitive, yet powerful 4-knob control panel Stereo Input and Output jacks. USB port N Onboard USB port for simple computer connection and firmware updates. MIDI Capable N Use the Soundblox HUB for MIDI access to control parameters and save up to 128 user presets