QVox by Eventide Inc. is a creative audio effect designed for iPhone that transforms vocals, guitars, drums, and synths into four independent voices. With diatonic pitch shifting and delay, users can create harmonies, widen instruments, and design rhythmic sequences. The app allows you to choose the key, scale, pitch, and delay interval for each voice, with real-time parameter adjustments using the Ribbon controller.

Featuring four independent voices labeled as A, B, C, D, QVox offers the ability to select Key and Scale for harmonies, group delays, sync delays to tempo, and dynamic modification of knobs via the Ribbon controller. It provides factory presets, user presets, and works as a standalone app, AudioUnit v3 effect, or Inter-App Audio effect.