This is almost certainly the coolest harmony pedal that's been invented. The Quintessence by TC Electronic is an intelligent harmonizer that responds to the notes that you're playing, rather than defaulting to "blocky" sounding intervals. Set the harmonies to 3rds, 5ths, or both, or use the tone print to add any harmony you need. The MASH feature allows for some insanely cool pitch-bending effects. There's virtually no limit to the harmony capabilities in the Quintessence.