Occasionally, VoiceTone knobs (pots) need to be re-calibrated. Craig shows you how. This fix, for knobs that choose the wrong key or style, applies to: VoiceTone C1, D1, E1, H1, R1, T1, X1, Mic Mechanic and Harmony Singer. For 2 switch VoiceTone products, like Harmony G-XT, Synth, Correct XT, Create XT and VoiceDoubler, the process is similar. Check out this FAQ for specifics: http://support.tc-helicon.com/entries/21065076-VoiceTone-Create-XT-Correct-XT-Harmony-G-XT-Synth-Re-calibrating-the-pots