As the name suggests, the correction is primarily a pitch correction pedal, and if the input is a microphone, it provides everything from pitch correction to serious effect overload. Starting from the vocal effect, the FV01 features three separate vocal effects, as shown by a striking tone LED in the center of the pedal. The singer can switch between warm, bright, and normal modes by indicating the type of EQ operation provided by the pedal. Combined with three different tone modes, the FV01 provides a separate knob for each key effect such as reverb, delay, and correction. The delay and reverb effect have 3 settings each, the pitch correction level can be adjusted from 0" 100, allowing for minor pitch correction and heavy vocal effects.