Sequenz CB-Prologue BL. This case is designed with removable padded inserts that allow you to carry both the 61-key Korg Prologue 16 and the 49-key Korg Prologue 8. The thick padded inserts provide protection for your precious synthesizer. The two-way design allows you to carry it on your back or in your hand, and it also features a practical pocket for storing cables or sheet music.