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Key Maps
Each entry in the patch-map translation table can have an associated key map.
Key maps affect note-on, note-off, and polyphonic-key-aftertouch messages. A
key map has a translation table with an entry for each of the 128 MIDI key
values. For example, if the entry for key value 60 is 72, the MIDI Mapper modifies
MIDI note-on messages as shown in the following illustration.
Key maps are useful with synthesizers that have key-based percussion
instruments with a particular percussion sound assigned to each key. Key maps are
usually assigned to the first patch in the patch maps on the percussion channels (10
and 16).
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