ALLEN & HEATH GL4800 User Manual page 44

44
Channel Mutes
Pressing any console mute switch transmits a MIDI Note On
message unless MIDI has been disabled. Similarly receiving
the correct Note On message will control the channel mute
unless it has been made 'mute safe' or MIDI disabled.
Console mutes are mapped to MIDI Note numbers as shown.
Running status is supported on receive and transmit.
TRANSMIT - Pressing a console mute transmits the following
Note On message:
9n cc vv cc 00
where n = console MIDI channel number
cc = console channel number
vv = 3FH for mute off, 7FH for mute on
RECEIVE - The console responds to the following MIDI Note
On message :
9n cc vv
Mute Snapshots
Recalling a snapshot will transmit a MIDI Program Change
message unless the snapshot system is disabled or MIDI is
disabled. Similarly receiving the correct Program Change
message will recall a console snapshot unless disabled.
Console snapshots are directly mapped to MIDI Program
Change numbers 0 to 127. Running status is supported on
receive and transmit.
TRANSMIT and RECEIVE - The message format is :
Cn pp
where n = console MIDI channel number
pp = console snapshot number 0-127
MIDI Dump Format
The format for Dump In and Dump Out is identical. The Dump
is made up of 128 System Exclusive messages (or packets)
which contain the contents of the console memory.
TRANSMIT and RECEIVE - The format for a single packet is
as follows :
F0 <sysex header> <packet no.> <data> <checksum> F7
<sysex header> = 00 00 1A 50 05 VV vv nn
VV = major software version number
vv = minor software version number
nn = console MIDI channel number
<packet no.> = packet number from 0 to 127
<data> = 7 bit block of console data followed by a
number of 00 pad bytes.
<checksum> = checksum to allow error detection.
( 00 is ignored)
V1.23
V1.23
GL4800
User Guide