cme uf50, usb midi master keyboard with integrated wireless midi transmission system, 49 keys semiweighted action keyboard with aftertouch, 9 fader, 8 potis, pitch- and modulationwheel, breath-controller connection, sustain- and expression-pedalconnection, 6 function buttons free allocatable, midi i/o, usb-connection (class compliant for win xp and mac osx), firewire digital audio 24bit/192khz stereo i/o interface or with optional soundmodul expansibility.