E-mu Proteus X
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E-mu Proteus X is a software-based audio sample-based synthesis module produced by E-mu Systems.
Its software runs on a PC running the Microsoft Windows XP or Windows 2000 operating system. For the software to run, a particular soundcard (an E-mu 0404) is required. (The soundcard acts as a dongle and as a DSP coprocessor.)
The module can operate as a stand-alone program or as a VST instrument. It has largely been superseded by the Proteus X2 software, which will work with any soundcard, but uses a contemporary E-mu keyboard, midi interface, or soundcard as a dongle.