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9.2
MIDI IMPLEMENTATION
Standard MIDI Control
The D-Mon processor can be remotely controlled using standard MIDI commands sent to the MIDI input port of the MPIO
connector. Simple commands such as volume control changes and note on/off are used. This allows speaker volume, dim and
mute; talkback switching; and headphone volume to be controlled by dedicated hardware on nearly any MIDI-equipped device.
The commands are:
Function
Midi
Channel
Message type
Parameters 1
Parameters 2
Main speaker set volume
1
Control change (0xB0)
Volume (0x07)
requested level
Headphones volume
2
Control Change (0xB1)
Volume (0x07)
requested level
Talkback volume
3
Control Change (0xB1)
Volume (0x07)
requested level
Listenback volume
4
Control Change (0xB1)
Volume (0x07)
requested level
Speaker Mute
1
Note On (0x80)
Note Off (0x90)
key H6 (0x5F)
velocity ignored (must
be > 0)
Speaker Dim
1
Note On (0x80)
Note Off (0x90)
key A6 (0x5D)
velocity ignored (must
be > 0)
Talkback
1
Note On (0x80)
Note Off (0x90)
key #A6 (0x5E)
velocity ignored (must
be > 0)
Talkback 2
1
Note On (0x80)
Note Off (0x90)
key #A7 (0x6A)
velocity ignored (must
be > 0)
Mono
1
Note On (0x80)
Note Off (0x90)
key #G6 (0x5C)
velocity ignored (must
be > 0)
The levels controlled by MIDI volume control changes are described by their second parameter according to the following table:
Meaning
Parameter 2 Value
(decimal / hexadecimal)
OFF
0 / 0x00
-95 dB
1 / 0x01
+ 0. dB
96 / 0x60
+ 30 dB
126 / 0x7E
+ 31 dB
127 / 0x7F