A multi-effects unit is a device used in music production that combines various audio effects into a single unit. These effects can include reverb, delay, distortion, and modulation, allowing musicians to shape their sound in versatile ways. Multi-effects units are popular among guitarists, vocalists, and electronic musicians for their convenience and wide range of options. Typically, these units can be used in live performances or in the studio, providing real-time control over effects settings. Many models also feature presets, enabling users to quickly switch between different sound configurations. Some well-known brands include Boss, Line 6, and Zoom.