Yamaha MX49 Music Synthesizer 49 Keys MX49 is a 49 key music synthesizer which combines Motif XS sounds, USB Audio/MIDI connectivity and advanced DAW/VST controller features at a groundbreaking level of affordability. Over 1000 Sounds from the MOTIF Series The MX series contains more than 1000 Voices derived directly from the world famous Yamaha MOTIF [Description & reviews]