Squeak,

I suspect it has something to do with the grounding system in your condo, therefore I suggest bypassing the ground system by using a ground defeater plug which is an inexpensive AC adapter plug. While I normally would not recommend using an ungrounded system, this may solve your problem.

Also, all keyboards are sensitive to the effects of radiation emmited by flourescent lighting, TV sets, microwave ovens, and even nearby telephone towers that utilize high level microwave signals. I know of one person who was hearing telephone conversations over their keyboard when the keyboard was turned on at higher volume levels and they were not playing.

Good Luck,

Gary