The GM Drum Map sets standard key assignments for the drums and cymbals in a typical trap kit, as well as assigning keys to a variety of other common percussion instruments. This was established as part of the overall General MIDI standard for maintaining compatibility when sharing MIDI recordings with other musicians and collaborators. It’s logical to start any discussion of drum mapping with the one established standard-the General MIDI (GM) Drum Map. This brings up a number of issues, which this article will take a brief look at. While there is a standard for this, it’s not universally used, and different drum instruments often utilize different arrangements of drums across the keyboard. But since the individual drum and cymbal samples in a virtual kit are un-pitched, key assignments are made at the discretion of either the person designing the patch, or the end user. With other sample-based instruments, the mapping is, of course, based on pitch-the individual samples are assigned to Root Keys that correspond to the notes on the MIDI keyboard that match the actual pitches sampled. Virtual drum instruments present a unique consideration-how to map the drums across the keyboard for live playing of drum parts.
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