The Mooer Tender Octaver Pro Twin Pedal is part of the Twin Series by Mooer which bring even more versatility and increased controls in a compact unit. The Tender Octaver hosts a whole range of Octave possibilities ranging from harmonising, pitch shifting and chorus effects. With both Sub and Upper Octaves, the Tender Octaver features separate Level and Tone controls for each. Other controls include Dry for altering the volume of the unaffected guitar signal and the Smooth control allows automatic volume swells, increasing the attack of the instrument. The Mooer Tender Octaver allows you to conveniently store and recall up to 4 user presets for when you find your ideal octave combination. For even further versatility, you can connect an external expression pedal to shape and control octave pitches.