The KORG RADIAS analog modeler is one of the most powerful expansion cards to date and works with complete plug and play functionality with the M3. You can add an internal RADIAS analog modeling ...
Korg EXB-PCM01 PCM EXPANSION BOARD - PIANOS-CLASSIC KEYBOARDS This board provides keyboard sounds such as piano, electric piano, clavinet, and electric organ that will accommodate any style of music. ...