Yamaha MEP4

Yamaha MEP4 is a multi-effects processor designed for live performance and recording. It is used by many professional musicians and producers, including the likes of John Mayer, Steve Vai, and Joe Satriani. The processor features a wide range of effects, including reverb, delay, chorus, flanger, and more. It also has a built-in expression pedal for controlling parameters such as volume, wah, and pitch. The processor is easy to use and has a user-friendly interface.