High Quality Content by WIKIPEDIA articles! The Yamaha MM6 is a Mid-Range synthesizer manufactured by the Yamaha Corporation, and was first introduced in January 2007. The MM6 includes fairly high quality samples for the price of the keyboard, however it is still a professional level piece of equipment. The default samples that ship on board the MM6 are based on the Yamaha Motif series workstation sound sets. The synthesizer ships with 418 voices, and 22 drum kits, all based upon those that ship with the Motif-series workstations.