Versatile LFO Shapes: Each section of the Electro-Harmonix Mod Rex offers four LFO shape options: rising sawtooth, triangle, falling sawtooth, or square wave for creative control Limitless Rhythm Options: Electro-Harmonix Mod Rex delivers virtually limitless polyrhythmic possibilities with nine note-length choices for each modulation section, independently selectable Four Modulation Powers: The Electro-Harmonix Mod Rex Polyrhythmic Modulator Guitar Pedal features four independent modulations - MOD, TREM, PAN, and FILTER, providing versatile modulation options