E-MU Xboard 49 Professional 49-Key USB/Midi Controller Keyboard 49 full-size professional keys with Aftertouch Includes full version of E-MU's Proteus X2 Streaming Sound Module with over 3GB of sounds Advanced studio/live performance features, like Latch Mode for triggering drum loops, Snap Shot for instantaneous program changes 16 real-time controllers that can be assigned to the key performance parameters of all your favorite virtual instruments PC & Mac compatible - Windows XP, 2000, x64 and Macintosh OS X drivers