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Weeping Demon pedal broke

Pedal powers up, signal passes, optical sensor lights up but as soon as the pedal moves the power on led goes off, sound cuts out completely, no wah. Also in traditional stomp pedal mode the signal passes but cannot get to switch the the wah mode.

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  • Music Master
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Suspect that the circuit board may have cracked in the vicinity of the power jack. Also check for a switch under the pedal. SOme have them and it might be broken.

Posted on Sep 30, 2009

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The foot pedal (not the switches) on my "DigiTech RP90 Modeling Guitar Processor does not work...it will move but it changes nothing.


All DigiTech expression pedals use an optical system instead of potentiometers.

Either the light is broke, or the filter.

The filter protrudes from the bottom of the pedal, and is darker at the top and gradually fades to clear at the bottom. If this breaks off, then there's nothing to limit the amount of light to the optical system.

If it is the light, then you'll have to have it serviced by someone qualified to work on it. Your local music shop should be able to help you out.


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Bypass is fine, LED lights when active, but signal is very low in volume when effect is active. Almost inaudible.


Make sure power voltage is adequate. If using a battery, the LED will light LONG after the batteery is beyond usability.

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There is a constant loud hum/buzz whenever I turn the pedal on. With my Boss Mt 2 Metal Zone effects pedal. It happens whether or not the power supply is plugged in. Ive tried switching cables and...


First and foremost , check your signal chain. By that, i mean put the pedal aside, ...just unhook it and take it out of your signal path. Using the same cables , guitar , amp, other pedals - borrow a friends MT-2 if you can get one , and try THAT to see if THAT works , OR any other kind of distortion pedal. If another one works ok , it's YOUR MT-2. Boss pedals are pretty rugged , but sometimes the little actuator (on/off switch) underneath the treadle (where you push your foot down) will become faulty. That's a high-gain pedal - are you using a basic Strat or other single-coil pickup guitar? If so , are you playing close to any flourescent lights? SIngle coils are noisy around those lights. Will cause a hum / buzz if using a heavy dist. pedal. You can check that by moving around as you play.

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Problem with the sound? Or is it?


I have this exact pedal. The sound should change as soon as you start pressing it down. With a wah, the frequencies are low at the heel down position and steadily change to a treble higher sound when in the toe-down position. Does the LED on the right side of the pedal come on when you press down? Are you using a fresh battery or a power supply with enough current? Is the "loudness" knob effecting the tone when turned up? If the answer to all of these questions is yes...then I would return it for a new one or send it to Morley for repair. They are nice sounding pedals. The problem could ultimately lie in the optical sensor that controls the wah effect.

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Sounds like a problem with the optical sensor. Your best bet would be to try to get a replacement from Ibanez or take it to a repairman. They are a resistor just like a pot but work by having an LED on one side and an optical "eye" on the other reading the amount of light passed thru transparent film. Morley has replacements for their wahs....not sure if its the same resistance. An audio repairman should hook you up.

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The Distortion Pedal has no effect on the sound.


i got d same problm. i fixed it myself.. check all the op amp ic's if they're all gud. if youre not sure, replace all 4 rc4558 ic's. in my case, i still felt a very small output signal from my pedal (equalizers, vol n gain ctrls r gud since they vary when i change the setting) so i suspected that one or 2 of my ic's were damaged. i only replace d last two op amps which my signal passes thru. i also had this problm with my marshall drive master. same diagnosis and solution. check your schematics

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