I'm afraid a serious problem has come to my home recording facility. It's a simple personal setting in my garage which I've transformed as a music space. Two computers (one laptop), two sound interfaces TC Twin Impact, a small 12 channels mixing table, a hi-fi system, keyboard, 4 different guitar/bass tube amplifiers, one digital modeled amp, effect units and some small gear around.
I record "pilot" versions of music pieces, so not aiming to crystal high end quality, but still decent. And most of all acceptably noiseless.
But here a problem appeared. Since few months I noticed a high "whistling" noise in my system when I plug any of my amplifiers with a guitar and (also the same in very high volume when my desktop computer is switched on). I spent quite few hours to test by excluding one by one different units. I also tested an amp with a guitar on other floors of my house and it has that high "whistling" noise everywhere. That's really frustrating, as I'm unable to continue recording anymore, the noise is always recorded.
I tried using a DI box, with no result at all. The mind blowing thing is that before I had no such a problem! I listen to past recordings and they are almost "crystal" clear! I'm heavily puzzled what could have happened and how should I go out of that situation! I've read some comments in the forums but they don't cover my problem.
*:-/ confused Any ideas or suggestions?