Yamaha PSR-S670 61-Key Arranger Workstation Voice & Style Expansion Packs enable you to customize your PSR-S series Arranger Workstation with a wide range of additional content from all over the world. Instantly access authentic new sounds, rhythms, and backing in the musical style of your choice. Mega Voices feature various playing articulations, techniques and performance sounds and are used in accompaniment Styles to provide ultra-realistic expression. The 16-track song recorder/player lets you create full arrangements or play back songs Accompaniment Styles add a "backing band" to your performances while you remain in complete control of chord changes and arrangements. USB Audio Recording & Playback captures performances on a USB drive