Oh, I get those coming-and-going buzzes too - but they are almost always caused by a close encounter with a pitcher of margaritas

Seriously, these are sometimes caused by some heavy load on the common power transformer (on the power pole) that you share with others in your immediate area. Something like an air conditioner, space heater etc. Also, if you have any light dimmers, these can sometimes cause buzz when the lights are dimmed down, but not fully off. Devices with high internal impedances are most succeptable to this, since the waveform that goes to the lightbulb is very 'spikey', which has a lot of high frequency components. If this is your problem, the cure is autotransformer light dimmers, or sometimes a good power line filter, like the TrippLite "Isobar". I think there might also be some SCR dimmers that don't radiate buzz too, but I don't have any names to give you. I use autotransformers.

[This message has been edited by soundhound (edited December 15, 2002).]