I loved buellrider97’s quote of “ Hold the TV antenna “.
I remember hearing that as a kid. I’d just touch the big metal tv channel selector know and the picture got better. My dad and older brothers would tell me to just stay right there! Don’t move!
Yes there is an effect/interaction with your body when you touch it. Also dimmer switches are notorious for causing hum, incandescent or LED. I’m having a very slight buzz with mine also. The LED track lights I first purchased weren’t dimmable so I went back those very small incandescent track lights which are controlled by a remote control dimmer switch. Works great and looks wonderful shunning down on the stereo system and speakers. I didn’t really notice the buzz until I was checking a different issue one night and turned the volume way up. I started checking for the buzz now and turned the lights up to look around. Of course as I turned the lights up the buzz changed and when the lights were on full the buzz was barely there. Turned the dimmer coming off and the buzz disappeared.
I have my entire stereo system on two separate 20 amp breakers which are independent from the lights. I also have a 20 amp balanced AC isolation transformer (Equi=Tech) which means the AC is 60-0-60 powering everything except my computer server. That is on one of the 20 amp lines going through a battery backup/regulated AC supply, then through a high end isolation transformer, then to the regulated 12V power supply with a very large bank of capacitors and up to the server. This also is USB isolated with an iFi galvanized power supply to my DAC.
So all this care and the buzz from the dimmer still comes through. Barely but it just shows the issue with dimmer switches. The only thing I can think of (if we want to keep some sort of AC dimming) is to research some sort of AC filtering that can be added right at the dimmer control. Ether a very small isolation transformer or EMI/RFI filtering system that would knock this out. It would have to be right in line with the switch so nothing from the switch or lights can feed back into the AC line.