James, I have had a dampp-chaser in my Kawai ust7 for the last 11 1/2 years. I have not had a thing to complain about it. No vibrations, just increased stability of tuning for my instrument. My tuning pins are tight and the action is still in excellent condition. Living in the midwest, we have quite severe swings in humidity and a climate control in the piano is a must, in my humble opinion. Sincerely, Karen Johnson ptg associate Rochester, MN << I am not a technician, but do "tinker" a bit with my piano. I have a Kawai US-6X upright. I was wondering if the Dampp-Chaser humidity control unit is worth installing in my piano. Does it really work? I was also curious if anyone has ever heard any complaints about this unit causing any vibration-like sounds since it sits inside the piano. >>
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