The good news is, the relay I use on my board doesn't buzz. 
I made sure the "normal" route through my DSS had the relay de energized, but that was just so it wasn't always on and drawing power. My DZ-1008 relays don't make any noise, they just don't do the full job. I hear the relays click as I change positions on the double-slip switches, but they're silent after that.
FWIW, I bought seven of the DZ-1008 relays, two were bad right out of the package! Not exactly a good batting average. For a little package that has a relay and a handful of components to provide the low voltage trigger, that's a pretty lousy batting average!
