This document is a reference manual that provides more advanced information about features of the Tyros4 keyboard that are not explained in the owner's manual. It includes chapters that correspond to chapters in the owner's manual, covering topics like voices, styles, songs, multi pads, the music finder, registration memory, audio recording/playback, vocal harmony, mixing console, internet connection, connections to other devices, and global utility settings. The manual provides instructions and parameters for editing many of the Tyros4's functions in more detail than the owner's manual.