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Post subject: Mustang II, Modulation glitch due to Voodoo Lab Pedal Power
Posted: Fri Mar 02, 2012 11:19 am
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I just purchased a Voodoo Lab Pedal Power 2+ for my pedalboard, and I immediately started having sound issues with my Mustang II (2 months old). I had to hook my computer to the amp to figure out what was going on. What I discovered was that the amp is automatically creating and deleting a modulation effect in the post-amp section. The whole effect turns on and off in a split second, causing the guitar sound to noticeably modulate for the split second. I tried creating a modulation effect pre-amp, but the amp will automatically delete it and start creating the post-amp glitch again. It happens on custom channels and factory presets. It basically renders the amp useless until I resolve the problem, or I have to unplug the Pedal Power.

I sent a video of it to Fender Customer Support, but I haven't heard back from them yet, so I wanted to ask all of you.

Has anyone else had this issue or have an idea what might be going on? I tried searching the forum, but I didn't find anything relevant.

Thanks in advance for any input.
JW


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Fri Mar 02, 2012 12:08 pm
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What does a power unit for your pedals have to do with the functionality of your AMP? OR is this just additional info of when the issue started - if that is the case then I suspect its not your Vood Lap Pedal Power BUT more of the fact that the amp cant handle too many effects chained coming into the amp...(I am speculating with no real basis behind it)..

Does the issue happen when you remove all pedals? Have you tried removing 1 pedal at a time to see if there is 1 specifically causing it.


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Fri Mar 02, 2012 12:16 pm
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I can have the Voodoo Lab plugged into one pedal and it will do it.

And I'm certain the Voodoo Lab is causing it because I can unplug the power supply from that 1 pedal forcing it to use the 9V inside and the issue will stop.

Therefore...
Guitar > 1 Pedal (voodoo powered) > Amp... causes the issue
Guitar > 1 Pedal (9V powered) > Amp... no issue


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Fri Mar 02, 2012 2:04 pm
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WOW! That is completely bizarre. One thing you might think about doing is to bring your pedal and Voodoo Lab Power unit to a Fender Mustang dealer, plug everything in like you would normally into one of their Mustangs and see if you can replicate the issue.
Having opened up my own MII, I know that there is very little in the way of shielding in these amps. So far, it has not been an issue for me in terms of RFI problems - Haven't had any errant radio stations coming through the amp. Very pleasantly surprising in light of the amount of shielding or lack thereof... knock on wood.

Here's where I'm going with this. Most digital devices create low level RFI noise.
Is the Voodoo Lab Pedal Power a digital switching unit? Could it be that the RFI noise it creates when in operation is somehow coming through its power output jack and is being sent through the pedal and into the amp. Does the Mustang's lack of shielding make it susceptible to this particular type of interference? You don't mention what type of pedal is being powered by the Voodoo Lab Pedal Power, but if it's an overdrive/distortion/booster pedal, could it be boosting the RFI?

I may be barking at the moon here but this is the only thing I can think of. Could you post some clips of the problem?

O.


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Fri Mar 02, 2012 4:51 pm
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Orca,
I think you are on to something. Honestly, I don't know a whole lot about shielding and RFI stuff. And I don't know if the pedal power is a digital switching unit, either.

The two pedals I had tested in the method I described earlier were a booster and an overdrive because those were the ones I already had 9V's in. I just tried the voodoo lab to power just a noise suppressor to run into the amp, and it isn't having the issue (yet). It's possible that the shielding you mentioned is the problem.

I'm new to posting on forums. Could you tell me how to post clips (if it's not too complicated)? :D

Thanks.
JW


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Fri Mar 02, 2012 11:27 pm
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JW, do you have a chorus pedal or a delay pedal that you can try? That would help narrow things down a bit.

As for posting clips, you'll have to record the Mustang with the pedals plugged in via USB or a microphone. Save the recorded file as an mp3 and upload it to a site such as http://www.soundclick.com/ and add a link to the clip on this thread on your next post.

O.


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Sat Mar 03, 2012 1:55 pm
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Update:

I've discovered that the glitch has something to do with the my Sennheiser wireless unit near my pedalboard. Even though it wasn't even plugged in to anything (no power, no cables), its proximity to anything on my pedalboard powered by my Voodoo Lab would cause the issue. Once I figured that out, I moved my Sennheiser unit across the room, and everything ran great for over an hour. To test my theory, I brought the unit close to my pedalboard again (still completely unplugged), and the issue came back within 30 seconds. Very weird... but at least I figured it out and can move on with my life. :D

Orca,
Unfortunately, the only pedals I have are my noise suppressor, two overdrives, a booster, and a delay. My delay is an Eventide Timefactor and requires using the wall wart it came with, so it doesn't get used by the Voodoo Lab, so it can't be tested in that way. Since I found the issue with my Sennheiser, I'm done searching for answers, but if you are interested in seeing the issue happen, I can post a short video of it. Thank you for your input. Ultimately, I think that helped me find the source of my problem.


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Sun Mar 04, 2012 5:33 pm
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h2ojwy wrote:
Update:

I've discovered that the glitch has something to do with the my Sennheiser wireless unit near my pedalboard. Even though it wasn't even plugged in to anything (no power, no cables), its proximity to anything on my pedalboard powered by my Voodoo Lab would cause the issue. Once I figured that out, I moved my Sennheiser unit across the room, and everything ran great for over an hour. To test my theory, I brought the unit close to my pedalboard again (still completely unplugged), and the issue came back within 30 seconds. Very weird... but at least I figured it out and can move on with my life. :D

Orca,
Unfortunately, the only pedals I have are my noise suppressor, two overdrives, a booster, and a delay. My delay is an Eventide Timefactor and requires using the wall wart it came with, so it doesn't get used by the Voodoo Lab, so it can't be tested in that way. Since I found the issue with my Sennheiser, I'm done searching for answers, but if you are interested in seeing the issue happen, I can post a short video of it. Thank you for your input. Ultimately, I think that helped me find the source of my problem.


No power, no cables and it still interfered? Wow... that's just bizarre! Is it radioactive? :wink:

O.


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Post subject: Re: Mustang II, Modulation glitch due to Voodoo Lab Pedal Po
Posted: Mon Mar 05, 2012 10:56 am
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Very strange. Is the wireless unit for wireless headphones or a mic?

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