The S90 XS from Yamaha is an 88 key balanced hammer action keyboard that's just as useful on stage as it is in the studio. It features all of the voices, performances, arps, and virtual circuit modeling found in the Motif XS. In addition to this, the S90 XS has 142 MB of samples dedicated to the S6 concert grand. Its lush piano sound and Motif capabilities, coupled with other useful features like a microphone/guitar input, audio recording, and computer control surface functionality make the S90 XS a powerful centerpiece in any musician's life.