Went from bass into brand new cable, into 4 way true bypass switcher, into another brand new cable, into headphone amp.
Tried several brands of patch cable at different positions in the looper. Just activating one loop with an EBS cable added tons of noise, but only with my dimmer lights switched on in the room. All my other patch cables with fully shielded metal jacks were fine.
You might find them to be ok at home until you end up on a stage with interference from nearby lighting or other equipment!