Power conditioner?

Hi everyone, HH

I am thinking I might be in need of a power conditioner. Not for my stereo, but for my recording gear. Even tho this is not a recording gear forum, I was thinking this would be a good place to ask.

I have several pieces of "studio recording" equip. daisy-chained in and out of my computer’s sound card, balanced XLR. There is some low-level noise that I would
like to get rid of if possible. Here is what it sounds like:

jeffreyhayat.com/temp/noise.wav

And here is what it looks like on a scope:

jeffreyhayat.com/temp/scope.jpg

That sound naturally comes in at around -72db, so I boosted it quite a bit to make it more audible. If you are going to have a listen, don’t turn the volume all the way up to hear it. It’s not 60-cycle hum; I guess it’s just the gear itself. But I still wonder if I can eliminate, or greatly reduce it. Every piece of gear, incl the computer, is plugged into a UPS, and that gets 120 (give or take) from the wall.

I tried a Furman from Guitar Center:

https://www.guitarcenter.com/Furman/M-8DX-Power-Conditioner-with-Lights-and-Meter-1273888004998.gc

Which did literally nothing. That means, a) a power conditioner is not what I need, or b) The Furman is too cheap a piece of gear to handle this

I was hoping to get some thoughts from people who know better than I. If a power conditioner is the answer, I will get one; I would like to try and keep it under 3k

Thanks in advance.