This is a reference manual for the PSR-S650 digital music workstation. The manual covers advanced features of the PSR-S650, including tone settings and functions, volume balance and sound quality adjustment, beat setter settings, mute bell tones, keyboard sensitivity settings, EQ settings, harmony/effect-related settings, accompaniment-related settings, song-related settings, song editing, creating original accompaniments, basic operations, etc. The manual also explains how to connect to a computer and use the Musicsoft Downloader software for data transfer.