Ravo MP-10 Owner's Manual - Value Button.
Manual is about: Guitar/Bass Multi-Effects Processor
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1. Turn the module selector to CTRL and turn the power on while pressing
VALUE button.
The expression pedal can be calibrated if necessary. If there does not seem to be much effect
even when you press the pedal, or the volume or tone changes greatly even when the pedal is
only pressed lightly, use the following procedures to readjust it.
LCD displays “EXP Pedal Calibration” 3 seconds and then display “Fully Raise Towards Heel”:
Expression Pedal Calibration
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