Question about Roland Gr33 Guitar Synthesizer

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Guitar out has no sound

Guitar is connected to the GR33 using the unit's cable connected to the pickup installed on an Ovation Legend. The mono out on the back of the unit delivering the synth sounds to a mixer works fine, but the Guitar Out on the back of the unit produces no sound, no matter what I connect it to.

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Paul Driessen

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You must connect a short jack cable between the GK2 or GK3 and you normal guitar jack out. Secondly, the switch on the GK should be in the middle, that will give synth & dry guitar simultaneously.

Posted on Jan 08, 2013


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Fred Yearian

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Make sure you use the ORIGINAL AC adapter with the unit. It takes a 9VAC one.

The adapter for the GR09 will NOT work and will act the way your unit is acting.

Posted on Oct 06, 2009


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2 Answers

Crackling through amp occasionally

There are only a few things that could be responsible for your problem. Dirty volume knob on guitar or amp. Faulty ground on all affected parts; including cables. I suggest you plug into a different amp with a new chord, and see if the problem still exists. This way you can quickly eliminate compnents & focus on the actua lproblematic one. If it still can assume it'sin the pick-up.

Dec 06, 2012 | Fishman Rare Earth Single Coil Acoustic...

1 Answer

The amp does not work at all even though the lights on the amp come on but when i connect it to the guitar no sound whatsoevva i checked the sound nobs on the guitar and the amp n all r ok but no soun

Have you checked a different cable?. Also, when you plug in the unit, there should be a "pop" if everything is turned on. If there isn't, the connection is bad someplace.

Aug 06, 2012 | Marshall Amplification Marshall MG15FX...

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I have an Ovation Celebrity Koa with the OP-30 system in it. When I plug it in, I don't always get sound. I changed the battery, and have a new patch cord. Can someone help me?

where the socket is for the cord to be plugged in, often the ground will come loose or break on the socket connection, you will need to take off the plate that conceals the electronics of the guitar and see if any wires have become damaged , this happens a lot when your using a patch cord with a 90 degree end going into the guitar , it puts added pressure on a already touchy socket.

Sep 01, 2011 | Ovation Ck047 Celebrity Acoustic Electric...

2 Answers

Getting hum through the speaker but when i put my hand on the jack socket it stops

If you are in the US, take a length of light-gauge wire (AWG 20-24) attach it to the center screw that keeps the cover on over the standard dual AC receptacle and to a screw on the back of your unit. This kind of problem often is caused by a poor grounding of the cover or chassis.

May 16, 2011 | Fishman Matrix Infinity Acoustic Pickup...

1 Answer

Hello! I've bought a Fender Rumble 75 about 3 months ago and it sounded great really but after some loud playing (About 75% of max volume) it started to buzz at midrange notes, and its gets worse as time...

Try plugging another sound source into the unit. The buzz MAY be pickup of magnetic fields in your guitar pickup that clobber your notes from the strings. Bad guitar cables are another possibility. By putting clean music from say a CD player into the unit you can find where the source is. If the CD player generates the same noises, then likely you have a failure of filter caps in the amp or other component failures. Also make sure your guitar can't "hear" the amp as feedback can do strange things.

Apr 23, 2011 | Fender Rumble 75 75watt Bass Guitar Combo...

2 Answers

My s5470 does not sustain well at all.also,the bridge pickup sounds ok but lacks ''attack'' in upper register.great guitar otherwise.i use a peavy 5150 60watt amp.

I personally use Seymour Duncan Humbucker pickups, and have never been disappointed. You might want to take your guitar up to a music shop and try it on different amps to see if your amp is your problem, or if it is your guitar's pickups or wiring. You could also try adjusting the height of the pickups until the sound you are looking for is achieved. I have also had guitar cables make a big difference in the sound. Make sure you have a good set of cables, and you may want to adjust the EQ settings of your amp to make up what the guitar lacks.

I’m happy to help further over the phone at

Apr 15, 2011 | Ibanez S5470 Prestige Electric Guitar

1 Answer

I have a sigma acoustc electric guitar and it's not picking up sound when plugged to an amp. What do I do?

First, make sure the volume is up on both the guitar and the amp. Obvious, i know, but it wouldn't be the first time a guitar's volume was overlooked.
Second, is there a crackle or a pop or anything if you plug the guitar in to a live amp (one that's already on and with some volume)? If not, then it's likely the cord or the amp, not the guitar.
Even if there is a sound when plugging in, try the guitar with a different cable (one you know works) and a different amp, if one's available. If there's still a problem, then it's probably the guitar.
Standard troubleshooting procedure is now officially out of the way.
Okay, so, I'm not terribly familiar with all the sigma models--in fact, I'd imagine it's hard to find someone who is--so I'm probably going to need a little more info.
Firstly, the model would probably help, and might answer the rest of these questions. Since Sigma wasn't always so helpful with serial numbers and such, we probably won't be able to get an exact ID on the guitar, but we might get a ballpark.
Next: Do you know if it's a passive or an active pickup? Is there a little light and/or button somewhere on the electronics that might be a battery indicator? If so, and nothing lights up when you push the button, see if you can change the battery easily. Sometimes it's obvious how to do this, and sometimes it's not. If it's not obvious, see if you can post a pic and we'll work it out.
If the battery is still good, then it's most likely a problem with the wiring connecting your pickup(s) and/or microphone(s) to the guitar's preamp electronics. With acoustic-electric guitars especially, it's hard for the actual pickups or mics to go bad without something happening to break them (like being dropped or whatever), and it's much more common that a wire gets pulled out or disconnected. Still, things do get old, and they do break.
See if you can tell what kind of pickup(s) and/or mic(s) you have in the guitar and take a look for any hanging wires. You may get lucky and just have something to re-attach, or it may be something easy to replace. Or, you may be stuck trying to order replacement parts from Martin.
If none of this finds the issue, and we can't figure it out with pics or model specs, I would recommend taking it in to a local music shop and having them work it out with Martin for you--they won't gouge you on the price, and they may even explain how to do the repair yourself.
Let me know when you have some more details or if this worked for you. Good luck!
(P.S. I completely feel your pain; my Ovation 1985 collector's series was recently without electrics until I tracked down a replacement pickup and rewired it.)

Mar 21, 2011 | Music

1 Answer

I my gr 20 is only picking up e a d g b and not the last string ,is there any way i can test it to find the fault please thnk you

If you want help from Roland you will have to register: That will get you access to full support and their email address. I think you are having problems with your GK-3 pickup. Make sure your string that you are having problems with is the optimal height etc. The adjustment for the GR-20 is in the manual at this link: Make sure your pickup is installed correctly and adjusted properly first. The manual is here: If you have everything adjusted and only one string is not working then I would guess you have a cable problem and the best thing is to contact Roland for advice. I didn't walk you through the adjustment because every installation for every guitar is different. Hope this helps.

Oct 24, 2010 | Roland Gr33 Guitar Synthesizer

1 Answer

Just got my fender 63 reverb reissue unit...and when i switch it on all i get is a loud buzzing hum type sound .

If you unplug the guitar cable and STILL get the hum, the unit has a defect... return under warranty.

If the hum goes away when you unplug the cable, replace the cable and see if new cable fixes the problem. If it does, the cable has a bad shield.

If the cable didn't cure it, then the guitar has a defect. Remember that some guitar pickups are sensitive to the magnetic fields from the amps... only cure is to either use humbucker types or be a distance away from the amp.

Jun 29, 2010 | Fender '63 Reverb

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