User guide

MPX 500 User Guide MIDI Operation
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To aid MIDI controllers (such as some foot controllers) which do not allow repeated Program
Change messages to be sent by a single button, the MPX 500 learns the next highest Program
Change along with every Program Change message it learns for Bypass and/or Tap. For
example, if you Learn Program Change 20 as the source for Bypass, Program Change 21 will
also control Bypass functions. To avoid conflicting Bypass and Tap assignments, leave a
space between the two buttons’ assignments. (i.e. if you learn Program Change 20 for Bypass,
remember that 21 will also be learned, so you will have to jump to Program Change 22 (and 23)
for Tap.
Clearing a Learned Assignment
1. Simultaneously press Store and Tap/Cancel to enter Learn Mode.
2. Turn the front panel control that you want to clear (Edit Knob 1-4 with the assigned parameter
displayed), Bypass or Tap) counterclockwise until None is displayed.
3. Press Store to execute.
3. Repeat Steps 2 and 3 to clear another front panel assignment.
5. Simultaneously press Store and Tap/Cancel to exit.
Learnable Front Panel controls and
Assignable MIDI Sources
MIDI MIDI
Front Panel Controllers Pgm Change
Control 1-31, 33-119 100-127
Mix Yes No
Effects Lvl/Bal Yes No
Adjust Yes No
Bypass Yes Yes
Tap Yes Yes