Disklavier

Hi Stew,

Sounds like you may be experiencing some RFI (radio frequency interference) especially if there is a high powered radio transmitter tower nearby (a few blocks away. 

Is there anything plugged into the "AUX IN" input jack?  If so unplug it and see if it goes away. It's possible the RFI is coming into the system and being amplified there. Especially if there is a long or coiled up un-shielded cable is plugged in.   

Does this model have a mic input? If so remove that cable to isolate where the RFI is coming into the system.

Also see if there is a way to turn down the volume on any unused input.

I wouldn't think it would come in via a MIDI input, but who knows. You may have to disconnect any cable connected until you isolate the source of the RFI.

Also make sure the Disklavier is plugged into a properly grounded electrical outlet. 

Good luck and let us know what you find! 

-Ken 

Ken Ruda