The M17 from Medeli features touch-response keys allow for a more expressive and nuanced performance, and is packed with many sounds and styles for experimentation, while its bass-boost stereo speaker system delivers impressive full range audio for small performances and home practice. FEEL-GOOD KEYSThe hallmark of the Medeli M17 is the highly playable touch sensitive 61 note keyboard. The exceptionally dynamic response ensures that the sound of the keyboard changes depending on how soft or hard you strike the keys. A Gentler touch will produce a much softer sound, whereas harder play produces a much louder sound, accurately simulating the feel of acoustic pianos.