The TC Helicon VoiceTone C1 effects pedal is a vocal processor aimed at providing transparent pitch correction as well as some not-so-subtle jagged and drastic effects. The C1 allows you to dynamically alter pitch correction via key, chromatically, or with a guitar via external input. In addition to having a dedicated knob for how clean or hard the effect is, there is also the availability to change your vocal biology wildly with the gender knob allowing for everything from soft pitch shifting to robotic and alien sounds.