Gender-Bending Vocal Effects! The VT-1 is a unique device designed for altering and effecting the human voice. It provides everything from voice "thickening" to a full +/-1 octave pitch shift, allowing users to convincingly change their vocal gender. Unlike conventional pitch shifters, the VT-1 affords separate control of pitch and formant, so the user's voice can be altered without the "chipmunk" effect.