Frontier AlphaTrack - Page 6

Button Up: 90 00 00 MIDI IN
LED On: 90 00 7f MIDI OUT
LED Off: 90 00 00 MIDI OUT
Footswitch...................................................... Footswitch Pressed: 90 67 7f MIDI IN
Footswitch Released: 90 67 00 MIDI IN
Note: The footswitch is assumed unpressed at power-up, and the polarity set accordingly.
Encoders, Fader, and Touchstrip
LEFT ENCODER (touch)....................................................Down: 90 78 7f MIDI IN
Up: 90 78 00 MIDI IN
LEFT ENCODER (push knob)............................................Down: 90 20 7f MIDI IN
Up: 90 20 00 MIDI IN
LEFT ENCODER (turn)................................................... Change: b0 10 nn MIDI IN
MIDDLE ENCODER (touch)..............................................Down: 90 79 7f MIDI IN
Up: 90 79 00 MIDI IN
MIDDLE ENCODER (push knob)......................................Down: 90 21 7f MIDI IN
Up: 90 21 00 MIDI IN
MIDDLE ENCODER (turn)............................................. Change: b0 11 nn MIDI IN
RIGHT ENCODER (touch).................................................Down: 90 7a 7f MIDI IN
Up: 90 7a 00 MIDI IN
RIGHT ENCODER (push knob) .........................................Down: 90 22 7f MIDI IN
Up: 90 22 00 MIDI IN
RIGHT ENCODER (turn) ................................................Change: b0 12 nn MIDI IN
where nn: forward 01 – 3f
backward 41 – 7f
Note: When changing, an encoder knob turn is updated via the MIDI IN port at a
maximum rate of about once every 15 msecs, although it is polled internally at a
much higher rate. Therefore, the encoder turn messages contain the number of
positive or negative ticks since the last encoder turn message. This is similar for
the touch strip, which senses at most 15 horizontal positions.
Examples:
4 middle encoder ticks clockwise rotation: 90 3c 04
3 right encoder ticks counterclockwise rotation: 90 3c 43
FADER (touch)...........................................................Start Touch: 90 68 7f MIDI IN
AlphaTrack Native Mode Version 1.0 Page 6 of 9