In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. An ideal instrument for the live performer, studio musician, church worship team leader or music teacher, the S90 comes equipped with the Balanced Hammer keyboard action and the same great sounds as the ground-breaking Motif 8 Music Production Synthesizer. In addition to the Motif sound collection, the S90 also features a new three-velocity S700 Yamaha grand piano sample giving it a total of 115 Mbytes of AWM2 Sample Rom.