<html> <body> Bruce, These are most likely longitudinal waves, and are part of the string scale of the piano.  Each piano will pick up on them differently, but they are audible to some degree or another on almost all pianos.  You can change the scale of those notes to shift the tones to a different (and hopefully less bothersome) pitch, but it will also change the tone quality at the same time. These are also greatly accentuated by voicing condition and room acoustics.  If the piano is in a live room, then adjusting the piano location or adding absorption to the room will change the relative loudness of these tones.  It will not eliminate it altogether. You might call us at Kawai if you would like to discuss it.  I will be back in the office next Wednesday if you would like to call me then. Don Mannino RPT Kawai America At 10:46 PM 5/26/2005, you wrote: <blockquote type=cite class=cite cite="">Hello everyone.   Bruce Gibson in Saskatoon, Saskatchewan, Canada here.   I have a client who has a Kawai RX-2. We changed the bass strings to GC Piano Co. strings because the client was complaining about obnoxious overtones. Many of the offending overtones are still there.   Any suggestions as to how I might go about eliminating them, or at very least reducing them. I've tried voicing the hammers...with not audible change.   Look forward to your input.   Thank you.   Bruce</blockquote></body> </html>