I have about 18 Yamaha C3s I tune on three cruise ships. Most of these pianos are played every day for several hours. I see them every two weeks. Each one gets a pretty thorough tuning every six weeks or so - the other visits they will get some level of touch-up. The environment on these 1,000-foot-long, ten story ships is VERY stable as there are very few doors and windows opening to the outside and the AC runs 24/7. When I come to each piano, it will have been reasonably well tuned two weeks prior. With respect to unisons, I'll typically see (well, hear...) one string out of every six or so half-steps beating and more whining a bit. What I find 95+% of the time is that if the pitch of a string has moved at all, the right string has gone a little bit sharp and the left string has gone maybe twice that amount flat. I'll be like that on virtually every single note that is making some noise. What on earth would cause such a phenomenon? Terry Farrell Port-of-Tampa PS: For any of you with tooooo much time on your hands, you can see my cruise ship (Carnival Legend was today) at the Port of Tampa on live streaming video - the cam is mounted atop the county building downtown Tampa. Go to http://cam01.hillsboroughcounty.org/user/JViewer.html and click on "Control" and click about a quarter inch away from the upper left hand corner of the grey mesh area that appears after you get control of the camera. Way cool, IMHO. The ship was late today and I could simply periodically check my computer to look at this webcam to see when the ship was approaching!
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