Check the listing for details. M-Audio Keystation 88 MK3 88-key Keyboard Controller. Condition: Very Good - Refurbished. Listed at 233.10 USD. Streamlined 88-note Keyboard Control The M-Audio Keystation 88 MK3 is the third generation of the world’s top-selling 88-note keyboard controller, and it incorporates improvements and refinements across the board. Many electronic musicians like having access to the full range of a piano keyboard. But not every keyboardist needs (or wants) hammer-action keys, along with the added weight, bulk, and expense. That explains why the M-Audio Keystation 88 series has been a best-seller here at Sweetwater; and indeed, worldwide. For these legions of players, the Keystation 88’s smooth semi-weighted key feel, streamlined control set, lightweight portability, and robust build quality hit the sweet spot. You don’t have to be a pianist to benefit from having 88 full-sized keys in front of you.