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Patch Maps
Each channel map entry can have an associated patch map. Patch maps affect
MIDI program-change and volume-controller messages. Program-change messages tell a
synthesizer to change the instrument sound (patch) for a specified channel.
Volume-controller messages set the volume for a channel.
A patch map has a translation table with an entry for each of the 128
program-change values. Each patch map specifies the following:
When program-change messages are received by the MIDI Mapper, the destination
program-change value is substituted for the program-change value in the
message. For example, if the destination program-change value for program-change 16 is
18, the MIDI Mapper modifies the MIDI program-change message as shown in the
following illustration.
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