The Yamaha MM6 is a Mid-Range synthesizer manufactured by the Yamaha Corporation, and was first introduced in January 2007. It is a Yamaha’s ‘baby’ version of the company’s flagship keyboard, the Motif. The MM6 includes fairly high quality samples for the price of the keyboard, however it is still a professional level piece of equipment. There are many DSP effects to choose from in the Edit and Utility menus. It comes with four classic knobs with controls such as Cutoff, Reso, Attack, Release. There are also Dual and Split buttons, made for quick sound layering and splitting. The MM6 also features an eight-track MIDI sequencer.
According to several user reviews, they have praised a Yamaha MM6 for the Very easy to use; Lots of effects. Also, users have complained it for the Feels a bit flimsy; Some instruments disappointing.
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To restores the initial default settings in Yamaha MM6, just simply turn the power on by pressing the [STANDBY/ON] switch while holding the highest white key on the keyboard.
Warning! This procedure will erase all backup data in the instrument’s memory and restores the initial default settings. Before you perform this operation, check whether there is any data you want to keep. This procedure also applies to the MM8 unit. Hopefully the article of “Initialize the Yamaha MM6 Music Synthesizer Workstation to Default Settings” can help you.
Reference: Yamaha MM6 manual