Apple Logic Pro 7.2 - Manual (Page 245)

Appendix
B
Logic
Control—MIDI
Implementation 245
External
Controller
Received:
None
Transmitted: B0,
2E,
vv External
Controller
changed
vv External
Controller
position
value
(00–7F)
Example:
Â
B0,
2E,
07
=
External
Controller
value
=
07
Jog
Wheel
Received: None
Transmitted: B0,
3C,
XX Jog
wheel
turned
by
user
XX delta
value
in
the
form
of
(0
s
v
v
v
v
v
v)
s direction
bit:
0
=
clockwise,
1
=
counter
clockwise
vv number
of
ticks
Examples:
Â
B0,
3C,
01
=
Jog
forward.
 B0,
3C,
41
=
Jog
reverse.