Question about MXR Phase 90 Pedal

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I'm experiencing an unwanted gain boost when using this pedal

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If using another pedal in the loop, change the orrder

Posted on Sep 01, 2010

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I have a Marshall ma100h that when boost is engaged hums incredibly loud. I've tried everything I can think of. The only thing to fix it is to turn the gain to zero.


I assume you've also made sure you're using a well sheilded intrument cable? If you're using a single coil pickup guitar like a Strat, you need to be sure you get the pickup cavity shielded. Past that it may be a bad tube in that gain stage.

Feb 06, 2015 | Marshall Amplification Marshall MA100H and...

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Boss ME-70 distortion changing mid play why.


Is distortion changes like we turn the OD/DS selector (changes to Boost-Natural-OD1-Blues etc)?
If so, the OD/DS potentiometer need to replace.24346541-2ss5ycyvkoajtv035dpuezke-4-0.jpg

If the changes are like increasing/decreasing GAIN/BASS/MID/TREBLE/LEVEL and also TYPE of pre-amp, then one of PREAMP potentiometer is bad.24346541-2ss5ycyvkoajtv035dpuezke-4-1.jpg

May 06, 2014 | Boss ME-70 Guitar Multiple Effects Pedal

1 Answer

Hot drive n boost not working


It's probably just the switch, nothing big, get the new one and you can solder it yourself. Or just let someone who knows do that for you, it's a cheap and fast thing.

Mar 03, 2014 | Martin Carl Hot Drive 'N Boost Mk 3 Pedal

1 Answer

Just bought a ps-6 today, tried it through my overall set up the pitch shifter, detuner & super bend are fine, as soon as i use the harmony setting it takes a sweet medium gain lead sound and adds the...


By ading in the harmony signals you are combining 3 signals so gain is probably going to be high you will have to reduce it before it goes to the amp or turn down the input gain of the amp.

NEVER use a pedal in the external effects loop of an amp as the levels are wrong.

Jul 26, 2011 | Roland Boss PS-6 Harmonist Pedal

1 Answer

When i plug an MXR micro amp (volume boost) in front of the supersonic, it works on the clean channel but does not affect the burn channel, Why? By the way, when plug in to the effect loop it does work...


DO NOT USE a guitar pedal in effects loop as it has the WRONG signal levels.

Also, when you boost the gain preceeding a distortion setting in an amp, the amp will just limit out and it will appear that the effects in the amp aren't working... but what is happening is you wind up with too much input signal and the "flat topping" distortion occurs right at the inout of the amp so no further can occur when you select a distortion in the amp.

Jun 22, 2011 | Fender SuperSonic 22 22W 1x12 Tube Guitar...

1 Answer

I'm getting a drastic level boost from my carbon copy pedal. this is an all of a sudden problem. I've had the pedal for about 6 months and it has worked fine up until now.


First thing to test: Do all the controls vary their function smoothly or does say the volume control vary the output only slightly. If the latter condition exists I would open the pedal and look for broken solder around one lead of the volume pot. The broken solder is hard to see... look for a little grey line on the menicus of the solder filet around each lead. Also look for cracks in the circuit board. Use a bright light.

May 05, 2011 | MXR Carbon Copy Analog Delay Pedal Guitar

1 Answer

Hi my zoom g1x fx is having some sound issues,it creates unpleasant noises and the sound kinda fades. I noticed the fading of the sound when i'm picking the thinner strings but it sounds so loud on the...


Hello I have this pedal too and have experienced similar problems..
If you are using battery power only use Duracell Ultra (or equivalent) never re-chargeable batteries. However I am assuming you are using the mains power adapter rather than batteries.
Start by eliminating external issues. Change your guitar lead and output lead - if you don't have spares swap them over or swap the ends round to make sure it is not a contact issue in the jack sockets.
I found this problem occurred most often when I was using headphones plugged directly into the pedal rather than an amp. I was usually able to solve it by wiggling the output jack plug slightly so came to the conclusion that it was just a poor quality plug or socket.
Having said that I think that there might be a bug in the processor unit itself because I have occasionally experienced the problem when playing through an amp. I resolved it by unplugging everything and starting again but this is a bit annoying either during a gig or half way through a recording session.
Does it do it on every patch or only on some? I have one patch that is completely clean (straight through) with no effects, noise reduction, boost, with the tone set at flat. You could try setting a patch like that up as a comparison and see if it still does it.
Lastly you could try recalibrating the expression pedal.
  1. Unplug the input jack to turn the unit off.
  2. Hold down the pedal assign button whilst plugging the input jack back in.
  3. The display should read 'dn'
  4. Raise the pedal fully and press the store key
  5. The display now reads 'UP'
  6. Push the pedal fully down to the stop and then release it (it will return slightly)
  7. Press the store key again
  8. Job done (unless the display reads 'Er' - in which case repeat from step 4)

Jan 30, 2011 | Zoom G1x Guitar Multi Effects Pedal with...

1 Answer

Is there some sort of trim pot or something in the block letter phase 90 where I can turn the volume boost down when it's on. I don't hate the sound of it but it gives me too much gain when I click it. I...


Have you tried experimenting with the order of your signal chain? Have a look at this link:http://www.zimbio.com/Guitar+Boomer/articles/36/How+Choose+Correct+Signal+Chain+Order+Effects

Jul 02, 2010 | MXR Phase 90 Pedal

1 Answer

Constant hum/buzz only when the distortion is turned up. Otherwise works fine. Already checked cables. Please help.


Distortion is a very HIGH gain operation and any hum on the input will be amplified many times.

Check your guitar AND input cable for ANY hum at all at high gain settings on the amp WITHOUT the pedal in line to assure that the source is not before the pedal.

ADDITIONAL cause could be a poor power adapter for the pedal or even a bad filter cap in the pedal.

Nov 02, 2009 | Boss Mt 2 Metal Zone Effects Pedal

1 Answer

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.

Nov 02, 2009 | Boss Mt 2 Metal Zone Effects Pedal

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