The Yamaha PSR-S775 is a 61-note arranger workstation keyboard that combines a wide range of sounds together with powerful performance features, providing the experience of performing in a band to the solo keyboard player. Two assignable live controllers, a modulation wheel and two assignable foot-pedal inputs ensure total control over voices, styles, effects, and other functions during live performance.A new DJ Styles concept features a collection of chord progressions that eliminate the need for continuous chord changes with the left hand. And to enhance practicing and performance, the optional Yamaha Chord Tracker app for iPhone and iPad instantly identifies and extracts any chord sequence from an audio track stored on the keyboard. Sound expansion is available using the 280MB of on-board expansion memory.The unit comes equipped with a microphone/guitar input that allows for adding vocals or guitar to a live performance. Plug in a microphone and assign any of the effects to the vocals. Or connect a guitar and adjust the parameters to suit. Whether enhancing a live performance with backing tracks from the music library, or livening up a party with some karaoke, the time stretch, pitch shift, and vocal cancel functions of the USB audio player will enhance any musical event. The Yamaha PSR-S775 includes a music rest and a power supply.