S90 XS/S70 XS Editor
S90 XS/S70 XS Editor 1.3 for Mac is available as a free download on our application library. This free software for Mac OS X was originally produced by Yamaha. S90 XS/S70 XS Editor for Mac lies within Audio & Video Tools, more precisely Music Production.
From the developer:
Exceptional quality instrument sounds. A piano sound to die for. A truly realistic, naturally expressive keyboard. Convenient, comprehensive control.
Real-time controls for tweaking of the sound as you play. Audio recording to USB memory. Extensive computer music features. Ease of use, plus compact size and portability. Introducing the S90 XS and S70 XS Music Synthesizer.
You may want to check out more software for Mac, such as S90 ES Master Editor, S90 ES Mix Editor or S90 ES Performance Editor, which might be related to S90 XS/S70 XS Editor.