I was getting the buzz in little short blips before I installed the switcher and the lcx is plugged into the same switcher and doesn’t have it. I confirmed by unplugging from the 789 while the buzz was happening, plugging into the lcx, it was gone, plugged back into the 789 and it was there again. for some reason adding the Loki to the chain before the 789 has turned the short spurts of buzz into it an ongoing buzz for long periods of time. Then it goes away for long periods of time. thanks for thinking about it and your response!