Gt Midi Implementation - Alesis QuadraVerb GT Service Manual

3 . 0 GT MIDI Implementation

System Exclusive Format
The Quadraverb-GT MIDI System Exclusive message format is as follows:
F0
00 00 0E
07
cc
dd
:
:
F7
OPCODES:
01 - MIDI Editing
F0 00 00 0E 07 01<function#><page#>< value1>< value2>< value3>F7
<function#>
<page#>
<value1-3> = new parameter value in the following format:
All parameters to be edited must be sent in this format (12 MIDI bytes), regardless of
the number of bits required to transmit the value of the parameter. When the QuadraVerb -GT
receives this message, it will edit the specified parameter to the new value and display it. If the
function and page selected does not exist in the current configuration, the command will be
ignored. If the value received is out of range for the parameter selected, the range will be limited
to a legal value. The function and page numbers for each parameter are shown in the next
section.
<data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used to
transmit each block of 7 QuadraVerb-GT data bytes. If the 7 data bytes are looked at as one 56-
bit word, the format for transmission is eight 7-bit words beginning with the most significant bit of
the first byte, as follows:
QuadraVerb GT Service Manual------
System exclusive status
Alesis manufacturer id#
Quadraverb-GT id#
Opcode
Data
:
End-Of-Exclusive
= 1=reverb,2=delay,3=pitch,4=eq,7=config, 8=mix, 9=name/mod, 10=preamp
= 0..n where n is the maximum page # for the selected function
Data: B7 B6 B5 B4 B3 B2 B1 B0 (MSB)
A7 A6 A5 A4 A3 A2 A1 A0
Sent: 0 A7 A6 A5 A4 A3 A2 A1
0 A0 B7 B6 B5 B4 B3 B2
0 B1 B0 0 0
02 - MIDI Data Dump F0 00 00 0E 07 02 <program#> <data> F7
<program#>
= 100 selects the edit buffer
= > 100 selects all 100 programs
10
(LSB)
<value1>
<value2>
0 0 0 <value3>
= 0..99 selects individual programs