Vodi

Vodi is a tool for modifying pitch, timbre, duration and adding audio effects. Vodi supports independent pitch and timbre modification in the real sense as opposed to other software tools for voice modification: You can hold the pitch constant and modify the timbre and vice versa, or you can modify them independently in desired amounts.

Changing the pitch results in a voice that sounds in a different tone as compared to the original. Duration modification enables varying the rate of the audio signal (speeding up or slowing down) without altering the spectral characteristics (i.e.

pitch and timbre).