Midi keyboard series native instruments komplete dimensions 1389 x 349 x 126 cm weight 144 kg keyboard graded hammer action keys weighted keys number of keys 88 assignable rotary encoders 8 interface usb 20 midi connectors 1 x midi in 1 x midi out software included komplete kontrol software os requirements ms windows 7 ms windows 8 apple macos 108 apple macos 109