Specifications

172 Appendix B Logic Control—MIDI Implementation
Common Control Messages
Faders
Received: Ei, ll, hh Move fader to position
Transmitted: Ei, ll, hh Fader moved by user
i Fader ID (00 thru 07; Master = 08)
ll Fader position value low 7 bits(00–7F)
hh Fader position value high 7 bits (00–7F)
Example: E0, 40, 55 = Fader Ch. 1, position (55 << 7) + 40
Note: Message format for transmitted fader position is the same as for received
position. Only the high 10 of the 14 transmitted bits are required. So positions 0 to 1023
(decimal) are transmitted as 0000 to 03FF (Ei 00 00 to Ei 7F 7F)
Switches
Received: None
Transmitted: 90, ii, ss Switch pressed/released by user
ii Switch ID (See Logic Control—Control Surface Layout and IDs section on page
181)
ss Switch State
00 = switch or fader released
7F = switch pressed or fader touched
Example: 90, 0F, 7F = SOLO Ch. 8 is pressed
90, 0F, 00 = SOLO Ch. 8 is released
Note: LEDs and switches use the same control message. This way, an LED has the same
ID as its corresponding switch.
LEDs
Received: 90, ii, ss Set LED status
Transmitted: None
ii LED ID (See Logic Control—Control Surface Layout and IDs section on page
181)
ss LED State (7F = on, 00 = off, 01 = flashing)
Example: 90, 08, 7F = Turn LED 08 on
90, 08, 00 = Turn LED 08 off
Note: Switches and LEDs use the same control message. In this way, an LED always
shares the same ID as its corresponding switch.