Audio Problems
Aside from the general suggestions given above, here are a few specific things to check for:
Symptom Possible Cause
Unit does not power up Not plugged in
Not switched on
Fuse is blown in unit
Wall power is bad
No sound, no signal LEDs Problem with instrument
Bad cable or connection going to MP-2
Some level parameter is set to zero.
Check: Master, Drive, OD, Loop A & B Mix
Stereo Volume Controller is set to zero
Gate Threshold is too high
No sound, LEDs OK Problem with amplifier/monitor system
Bad cable or connection going from MP-2
Output Level control set to zero
Tuner Mute is engaged
Some level parameter is set to zero, (see list above)
Unwanted distortion Bad cable going to or from the MP-2
Problem in instrument or amplifier/monitor system
Effects Loop or XLR Level switches set incorrectly
Too much level within MP-2 (indicated by signal LEDs
glowing red).
Hum Bad cable
Problem in instrument or amplifier/monitor system
Ground loop (try Pin 1 Lift switch)
MIDI Problems
No response to controller Incorrect or faulty MIDI cabling
MIDI channel not set to match controller
MIDI channel set to "Off
No response to Incorrect RTM assignment Parameters under
continuous controllers control not "captured"
Incorrect program changes MIDI map improperly set up
Does not receive library Incorrect or faulty MIDI cabling
or program MIDI channel not set to match source
MIDI channel set to "Off
The MIDI Monitor function found in System Edit mode displays incoming controller and
program change messages. This can be very helpful in trying to isolate MIDI problems. The
MIDI Mismatch Warning function, also found in System Edit mode, when enabled, displays
a warning when the MP-2 receives MIDI messages on a different channel than that to which
it is currently set. This, too, can be useful in troubleshooting.
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