Hi, people! My name is Iskander Gafarov, I'm from Russia. I need your help, guys This thread is not just specially about RME BF Pro though I use one. If I had created a thread in a wrong forum branch - please, move it.

I was recording vocals with my old setup, which is M-Audio Audiophile 192 (internal, PCIe) - Digilab SPM 250 Studio Channel (russian preamp), Oktava MKL-4000 (russian tube mic with its own power supply) and old PC which I use just for recording vocals in university. Everything was fine for a year until maybe a week ago I noticed that there is some kind of high frequency (between 4 kHz and 7 kHz) itchy noise ("zzzzzz") in recorded signal, which sounds like moderate distortion/saturation. Somehow it shows up only with pretty loud vocals and the problem is fading away a little bit if I place singer at 60-70cm proximity from mic, which is not acceptable in my recording room (it's pretty bad in terms of being sound-proof).

So I decided to try out my very old mic Presonus M7 coupled with RME Babyface Pro (I usually do use them at home) with this old PC and... the same noise appeared again! Changing mic to Neumann Gefell UM57 didn't help as well. So there are another mics, different preamps, another audio-interface, I tried several XLR-XLR cables with no result (fully 3 pin individually, not 1-3 pin connected ones), I've tried to remove and bring back pop-filter, different mic mount ant etc - nothing helps.

What is the next step?

By the way, there are some other issues that can be potentially related to unwanted noise.
- That old PC's power supply began to emit a high pitch noise from one of its condenser, I understand this is actually not a good thing, but can it somehow have an impact on sound in PC?
- I'm working in the university for 5 years (where I do all the records) and all those 5 years I was struggling with grounding/electricity issues in nearly every room. For example, switching off some devices in our conference hall (like wireless microphone system's base which is already disconnected from mixer) will produce a little "boom" sound in nearest big speakers, accidentaly touching XLR input in 16-channel analog multi-core will zap me a little bit, connecting wireless microphone's bases to Peavey Escort 3000 (compact amplifying combo) via unbalanced connetion (TS instead of TRS or 1+3 pinned XLR cable or TS-XLR cable) will always result in adding some 50hz noise somehow. Can it be important when it comes to external BF Pro and recording signal?
- Should I try use different tracking headphones? Mine are closed one, so I don't know if it's related.

Thank you, with love from Russia.