Mike,

I understand the work around to fix a problem that should not normally exist.

If you hear buzzing in your headphones, you got a hardware problem .. Could be as Jerry suggests.

If you do not hear buzzing, check all cables, Preamps, Possible blown tweeters, digital clock source..... (make sure you have good headphones ..)

Believe me.. Those work arounds are just "Polishing a T---" Fix the problem and enjoy how great the piano should sound.

I speak from playing and adjusting "Hundreds" of K's.
I know what they are supposed to sound like and the problems you and others have described are the exception, not the rule.