Alesis MMT-8 Service Manual

Alesis MMT-8 Service Manual 1.00 11
Each data event within a track consists of either 7 or 5 bytes, depending on whether or not other events exists
on that same clock step. The 7 byte format is as follows:
Byte # Format Comment
1 1nnnnnnn note or controller number
2 xxxxxxxx absolute start time lsb
3 yyyyyyyy absolute start time msb
4 zvvvvvvv note/controller flag, velocity or controller amount
5 0000cccc MIDI channel number
6 0aaaaaaa note duration msb or pitch bend lsb
7 bbbbbbbb note duration lsb or pitch bend msb
The 5 byte format is similar, but does not include a start time:
Byte # Format Comment
1 0nnnnnnn note or controller number
2 zvvvvvvv note/controller flag, velocity or controller amount
3 0000cccc MIDI channel number
4 0aaaaaaa note duration msb or pitch bend lsb
5 bbbbbbbb note duration lsb or pitch bend msb
Note that the most significant bit of each packet determines the length of the packet: A 7 byte packet has its
1st byte msb set to 1, while a 5 byte packet has the 1st byte msb set to 0. Each packet contains one of the
following seven events: Note event (with duration), controller 0-121 event, program change event, after
touch event, pitch bend event, sysex event, or end of track event. The five byte packet versions of these
events are shown below. If the event is a seven byte packet, the second and third bytes will contain the clock
count at which the event should occur. Each clock count = 1/384th note (4 times MIDI clock resolution),
with 0000 = first beat of sequence. 5 byte packets always occur on the clock specified by the nearest 7 byte
packet preceeding it.
Note format:
0nnnnnnn Note number 0-127
0vvvvvvv Velocity 1-127
0000cccc MIDI channel number 0 through 15
0aaaaaaa Note duration msb (number of clocks until note off)
bbbbbbbb Note duration lsb (number of clocks until note off)
Controller 0-121 format:
0nnnnnnn Controller number 0-121
1vvvvvvv Controller amount
0000cccc MIDI channel number 0-15
00000000 not used
00000000 not used
Program change format:
01111010 Program change flag (122)
1vvvvvvv Program number 0-127
0000cccc MIDI channel number 0-15
00000000 not used

Alesis MMT-8 Specifications

General

Brand	Alesis
Model	MMT-8
Category	Recording Equipment
Language	English