I got so much help here the other day that I wanted to post this one (though not sure
if it's the right section).
 
Noise:   http://picosong.com/download/bNq7/
 
It is happening on the audio signal from my electronic drum kit (Roland TD-20).
It's soft when the actual drum sounds are playing (which I'm triggering from midi), but
I'm tracking each drum separately and it adds up.
NOTE: I have isolated and boosted it a lot (so you can hear it clearly).
 
I have tried switching the power sockets I'm plugging in to but it doesn't sound like simply
ground noise anyway (at least with the clip I just heard online). - Of supposed ground noise.
 
It covers an annoyingly large spectrum so will be hard to digitally remove.
 
Thanks.
 
 
Spectral analysis:

 
 

Florescent lights.  Dimmers.  Bad cable shielding.

BobF
Florescent lights.  Dimmers.  Bad cable shielding.

No reason for it to be any of those in my setup.
Top of the range cables, and I don't have dimmers or florescent lights.
 
Am I correct in believing this is not ground noise?
 
Also: If I take one of the leads out of the unit this signal doubles in strength on the remaining lead (not sure if that means anything).
 
EDIT: It's definitely power related, if I monitor the track (with everything boosted) and have the unit turned off it's still basically as loud. As soon as I disconnect the power cable it stops..
 
As a solution (if nothing physical can be done):  I guess I could create a lot of EQ plugins and reading the spectral analysis try to match/reverse each spike (in the exact amount)?

Top of the range cables doesn't mean there can't be a defect.
 
Sorry, that was my full load of ideas.

I had something like that when AC power adapter was too close to the audio cables.

Did you remove the .mp3? Without hearing it, it is hard to know what it is - some kind of interference, I infer.

stickman393
Did you remove the .mp3? Without hearing it, it is hard to know what it is - some kind of interference, I infer.

No but I haven't used that site before. It looks like they changed their internal reference for it for some reason.
It has a new link now so I will just link the page the links will always be on:
Will change the link in the first comment also.
 
http://picosong.com/download/bNq7/
 

I encountered a problem like this when I had a polarity problem in my power lines.  Everything checked out fine, but with some equipment it created a buzz.
 
There are cheap circuit checkers available at hardware stores that will show ground faults, polarity problems and other issues. http: // www.amazon.com/GE-50542-3-Wire-Receptacle-Tester/dp/B002LZTKIA/ref=sr_1_1?ie=UTF8&qid=1448761735&sr=8-1&keywords=circuit+checker.  The pattern of lights on the device correlates to the circuit problem.  It's a handy tool and worth $5 - $8.

I am hearing a faint Lumber Liquidator's commercial after the loudest buzzing stops. That would lead me to think you are picking up interference from something in your setup or wiring acting as an antenna if this is really coming from a drum set and not a cheap radio. 

What you describe above e.g. doubling and the power cord would lead me to look for a ground loop. The audio sounds like electric hum that has been filtered. I don't see a 120 Hz peak on the spectral analysis. The sonitus equalizer has a Hum Removal (50 Hz) and a Hum Removal (60 Hz) preset that should get rid of most of it. You might have to play around with the frequencies but keep the stopband narrow (high Q).