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I've made this video -- https://www.youtube.com/playlist?list=PLUgE6dqIXiEsDT3DzqwXMtqndPTuMQe7D

New things that didn't work: Blackmagic Shuttle Usb 3.0(doesn't like linux), Light bar (I used wrong power supply).

New things that worked: Audacity Hum remover for removing 60Hz noise

https://wiki.audacityteam.org/wiki/Nyquist_Effect_Plug-ins#Hum_Remover

Right now there are two sources of noise: 60Hz electric hum and white noise from amplifying wireless mic too much. I'm able to remove most of the white noise with standard audacity Noise Reduction filter.