Might be in the wrong thread, if I am, my apologies. I had my Rick 4003 fully screened and now at home in the ‘music room’ it’s totally quiet, amazing. The noise from the Markbass fan (like on a pc) is greater than any ambient noise. But in some places I play there seems to be interference from magnetic induction hearing aid loops and sometimes even radio mikes which then gets into my signal chain, a real pain, and yet in others everything is as sweet as a nut. I did think of getting an antinoise pedal but I doubt that’ll help. Oh well, rant over. Hopefully you guys might have some ideas or even practical experience to cure this.