The GM protocol defines a "mapping" of sounds, associating a certain MIDI channel to each sound. This way a MIDI score obtained by using a certain kind of keyboard or module can be played by another module without the corresponding sounds getting modified.
Wikipedia contents related with Comparison of MIDI standards
GM MODULES for the MASSES Our GM/XG/GS sound module roundup reveals some winners with general appeal.In the beginning there was MIDI. Well, actually, there wasn't; there was chaos, at least when it came to communication protocols for electronic instruments. With each manufacturer paddling its own canoe, the time was ripe for a new standard that would let synthesizers and sound modules speak to each another. The development
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