I can hear the four LFOs cycling through my amp when the module isn't patched. Unfortunately, it's pretty loud. This seems to be a common problem with LFOs in general when the rack is plugged into older, ungrounded electrical systems like mine. The signal noise disappears when I unplug the LFO from the PSU.

I assume the noise would go away if the outlet were grounded; and, eventually, I may ground that specific outlet. Until then, are there any practical ways I could at least dampen that unwanted signal? Thanks.

https://cdn.modulargrid.net/img/racks/modulargrid_853360.jpg