Ghostbusting like @Whying_Dutchman said ?
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Or just start turning stuff off. try computers first, lights (dimmer switches can contribute), wifi access points, and microwaves.
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https://www.dropbox.com/scl/fi/szvf9zwntt7dye9w45rkc/Recording_18.wav?rlkey=bk6qxety23aaoskkr7k647otg&dl=0
Literally this.
If I am playing I don’t hear it… and I never noticed it in reaper.
Pretty sure T1s are absorbing noise from somewhere.
From Amp… nothing.
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I get the exact same buzz on my setup when my bass isn’t hooked up and the cable is laying on the floor.
Bass - Zoom - Focusrite Solo - PC.
Headphones into Solo. Use the Fender Pro series cable (the soft rubbery ones that don’t kink)
Plug in bass and it goes to minimal but I can still hear it until I start playing.
Hold cable up off floor and it is almost minimal.
Not sure if that helps any or not.
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I don’t leave my cables plugged… and non used audio inputs / outputs are at a minimum.
On headphones, buzzing also seems lower… but its there.
Anyhow… mysteries.
For example… now with bass on max, focusrite on middle… noise is minimal… moving mouse noise appears… I am literally going bananas with this! 
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is it a wireless mouse? Could be RF interference from the mouse, could be from the PC 
Seriously, turn everything off except the bass, interface, and monitor speakers.
Everything.
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BRB 
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Ok… FFS… lots of investigating.
- Fully powering down screens (button, not sleep only), helps.
- Fully turning off PC and moving to a different laptop(Alienware m17 R5) I have for my coaching work, 0 buzzing… but only if I use a USB3.0 interface - 2.0 had noise, which is weird because in 2i2 is 2.0.
- Connecting to Linux PC(old) just for power also works.
It really boils down to my desk area / certain laptops. (Corporate dell, same noise)
Anyhow… if I ever need to record something, now I know I have to use the other laptop… or find a way to identify source of interference in my PC / desk.
It is a 24c CPU with tons of Cooling / fans. LEDs are all powered off(well… all that I can power off) I am tempted to try and use the back USB3.0 ports instead of only the front 3.0 on PC, but cable is too short 
EDIT: Remembered my bedroom charger is USBA to USBC. Buzzing reduced a bit. Yeah… PC problems. GRRRR
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It’s probably RFI leaking from the case. My PC has a plexi side and it is leaky AF. I never use it for music any more, just my mac (dead silent).
Note that if the RFI is strong enough, nothing about the bass - shielding, pickups, grounding - nothing matters. I have had it audible in humbuckers on a well shielded and grounded bass.
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And from the noise it might be mimicking the GPU (6800XT)… although fans on it only trigger at 60 degrees… and it’s at 40 atm.
Maybe if I record something, I have to use the Alienware.
Anyhow… thanks for your patience!
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An email to send tomorrow…
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Bad usb ports can also be the issue. Did you tried different ports?
Edit: nevermind I already see you bought something. Hope it solves your problem!
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I’ve tried multiple USB ports… and multiple cables… USBA-USBC; USBC-USBC, different instuments, etc.
I didn’t buy anything… just emailing these iFi guys, as it’s 170€ that I don’t know if it will be the solution. Since they have an entire company dedicated to RF noise… hopefully they can help.
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Small update on this… after more rearrangements and recablings, noise reduced a little bit.
In the meantime I have reached out to a company called ifi-audio, that make a product called iDefender, that is basically a ground loop isolator / killer.
They will let me do a test run of the device to see if it solves my issue.
I will post an extended review here and in the focusrite sub on reddit… to hopefully be able to help people with similar problems!
Will keep you posted!
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Yay. Problem found.
Now getting a device to effectively see it it sorts my issue.
ifi Defender+ and iPower2.
They will let me test and I can ask for refund if they don’t work.
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Ok… the devices arrived.
Just scrambled 3 quick audios for a very quick test.
No iDefender+. Focusrite direct to PC - Distant from PC.
iDefender+ Powered - Cutting Ground loops - Sitting at PC
iDefender+ Not powered - Passthrough - Distant from PC
All files as embedding not working properly.
Basically just an audio test… to try and see differences.
Let me know what you hear.
EDIT: Added soundcloud links.
Maybe upload it to a format we can click on? i.e soundcloud?
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My “main” soundcloud account was full.
Created a new one… but still they don’t appear as play buttons.
I’ll find a way.
Here’s an example of a SoundCloud link Josh posted that appears as a playable “button”:
https://soundcloud.com/bass_buzz/daily-mistakes-exercise
When I click one of the links you posted, it takes me to the SoundCloud app. Maybe you’re not using the correct link format?
Will check later at home.
I dont remember seeing a link like that on the share options but will check again!
Thanks
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