While they work for most people on Windows 2000, Windows XP, and Windows Vista 32-bit, all but Emulator X3 are only tested and currently supported for Windows XP. Proteus X LE, Proteus VX, Proteus X, Proteus X2, Emulator X, Emulator X2 and Emulator X3 only work on an IBM compatible type PC. E-MU Proteus X is a Virtual Sound Module produced by E-MU Systems that is a software-based audio sample-based synthesis product that includes the complete library soundest of the popular and legacy Proteus 2000 MIDI Module, as well as additional sounds/samples.