Every pedal I buy has a loud buzz. Help!!

Basic trouble-shooting:
1. turn on amp, turn off standby
2. plug in amp-in cord
3. plug in pedal, without battery, with batt., with power supply(s)
4. plug in pedal-in input cord
5. plug in bass(es)

One of those steps will likely and obviously increase the noise; when you find that, try variations (ex., new outlet, new cord, new power source, new bass) and/or post back.

I've done a similar process... but I also try it in different rooms or locations. Took me forever to realize one of the outlets in my music room was the issue.
 
This problem was solved by taking the battery out of the pedal. It's quiet enough now. I think I'll keep the pedal, although it's not a whole heck of a lot different from my Big Muff pi. I think it might have a little bit more in the low end, which is what I'm looking for. We'll see how it cuts through the mix at the next gig. Thanks again to all who chimed in.
 
The battery has zero effect when external power is connected. The battery gets disconnected.

If that's the case, I'm totally at a loss to explain why the pedal is now useable. For the previous fuzz pedal I tried, a Death By Audio Absolute Destruction, it didn't make any difference if I ran the 9v power supply into the pedal while the battery was still in it. There was so much buzz, both on my bass, and our guitarist's rig, I just sent it back to where I bought it. Like I posted, once I took out the battery of the Fat Fuzz Facotry, that buzz is manageable. I can still hear it very faintly if I turn down the compressor and gate real far. I don't like the pedal set that way, anyway. I dunno, maybe the battery was shorting, or possibly the transistors inside just started to work better once the battery was out of there. Or the Gods stepped in to help. All I know is that it's working, and I'm going to try it out on my next gig, see if it cuts through better than the Big Muff pi.
 
@Mr. Chuffey ,
You haven’t answered any of the questions about what does or does not change the noise.
I'm not sure what questions I didn't answer, but I swapped cords around (they're all good), I took my phone out of the room, I tried different power conditioners and/or not using my power conditioners, had the pedal not running through the pedal board, got down on my knees and prayed. None of that worked to get rid of the buzz. Took out the battery - boom, problem fixed. That's all I can tell ya. I know it doesn't make sense, because as far as I know, you're right, running a pedal with a power supply and a battery at the same time shouldn't be a problem. But it seems that for this pedal it was.
 
I'm not sure what questions I didn't answer, but I swapped cords around (they're all good), I took my phone out of the room, I tried different power conditioners and/or not using my power conditioners, had the pedal not running through the pedal board, got down on my knees and prayed. None of that worked to get rid of the buzz. Took out the battery - boom, problem fixed. That's all I can tell ya. I know it doesn't make sense, because as far as I know, you're right, running a pedal with a power supply and a battery at the same time shouldn't be a problem. But it seems that for this pedal it was.

As a heads up for future troubleshooting - since you experienced this with other pedals as well...

I've had certain dirt/high-gain pedals that did not agree with most of my 'wall-wart' power supplies. This included ones that came with various pedals from the manufacturer, and a 1-spot. They did, however, work perfectly and quietly when using a proper, high-quality isolated power supply. All that is to say, you haven't really ruled out the power supplies as the issue just because they are quiet with your other pedals or quiet with another fuzz.

Additionally, the room issue is worth noting. I've had 2 basses that were incredibly noisy in my old house (picking up RF/EMI) while all my other basses and equipment were fine in that house. High gain pedals have the potential to magnify that.
 
Oh it's still there... you're just not hearing it.
This. A noise gate only cuts the noise out when you're not playing. Soon as a note overpowers the gate, the noise is there with the note. In a bar gig, NBD, but you wouldn't want that sound quality when sound quality counts.
 
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