Roland VE-7000, Owner'S Manual

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MIDI Implementation
4. Control data transmission data
The following data is transmitted by each type of controller.
01H Transmitted when pressed
02H Transmitted when released
03H Transmitted 0.3 seconds after pressed.
Successively transmitted every 0.1 seconds until released.
Dial controllers
Dial rotation expressed as a 7-bit binary complement. Positive values (1--63)
indicate clockwise rotation, and negative values (-1 to -64) indicate
counterclockwise rotation. The units are the number of clicks. One complete
turn is 24 clicks. An interval of at least 0.1 second is maintained between
transmitting changes in the dial position.
Joystick controller
Horizontal position is expressed as data of 0 for the left edge and 127 as the
right edge.
Vertical position is expressed as data of 0 as bottom (toward yourself) and
127 as top (away from yourself).
An interval of at least 0.1 second is maintained between each transmission
of changes.