Eventide QuadravoxIntuitive Compositions Quadravox is a unique composition tool designed to inspire songwriting, stack harmonies, widen instruments, and offer creative innovative rhythmic sequences. With Quadravox, you can take any incoming tones, including drums, and generate up to four voices based on the chosen key and timing interval. Its optimized for multiple instances so your tracks can interact with each other by way of beautiful harmonies and groovy sequences.