[OT, but important] GND lift how to do and the dangerous

[Ralf Mardorf]

PS:

We do have mains filters and OTOH we do use switching power supplies
that pollute the mains. For professional audio and video we should keep
in mind old faithful analog technique and adapt this to the new digital
world, but just using all this consumer crap.

In the eighties I made professional recordings with ElCheapo home
recording equipment, today I've got much better equipment by theory and
I'm not able to reach the quality I reached in the eighties. There's too
much hype about crap, such as switching power supplies.