Kurzweil produces electronic musical instruments for professional musicians! Kurzweil's Forte Series of Stage Pianos are the most advanced keyboard to ever wear the Kurzweil logo.  Their PC4 Production Controller Series comes in a fully weighted and semi weighted semi-weighted action with velocity and pressure (aftertouch) sensitive adjustable keys as well at the Artis in that series & the feature laden  budget priced KM88 is in the Controller Series. The SP6 models are in their Stage Piano Series & the K2700 is ultimate kyeboard workstation. Distributed in the USA by American Music & Sound.