I dont have any dimming LED lights in the house dont think they are CFL bulbs, but if that was the case id expect a bit of buzz this is quite a lot high pitched very noticeable. So both are plugged into a belkin surge protected mult plug. The yamaha has no buzzing when i unplug the Helix from it.... Oh yea and im firmware version 2.210 if that helps
thanks for the help btw :)