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The MIDI Mapper is part of the system software. The following illustration shows how the MIDI Mapper relates to other elements of the audio services.
From the viewpoint of an application, the MIDI Mapper looks like another MIDI output device. The MIDI Mapper receives messages sent to it by the low-level MIDI output functions midiOutShortMsg and midiOutLongMsg. The MIDI Mapper modifies these messages and redirects them to a MIDI output device according to the current MIDI setup map. The current MIDI setup map is selected by the user by means of the MIDI Control Panel option. Only the user can select the current setup map; applications cannot change the current setup map.
-->The MIDI Mapper's standard patch services provide device-independent MIDI file playback for applications. The MIDI Mapper can be used with the MCI MIDI sequencer or with low-level MIDI output services.
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Unless stated otherwise, all references to MIDI channel numbers use the logical channel numbers 1 through 16. These logical channel numbers correspond to the physical channel numbers 0 through 15 that are actually part of the MIDI message. All references to MIDI program-change and key values use the physical values 0 through 127. All numbers are decimal unless preceded by '0x' prefix, in which case they are hexadecimal.
In the discussion of the MIDI Mapper, the term source refers to the input side of the MIDI Mapper. The term destination refers to the output side of the MIDI Mapper. For example, a source channel is the MIDI channel of a message sent to the MIDI Mapper, and a destination channel is the MIDI channel of a message sent from the MIDI Mapper to an output device.