Tuned a Yamaha P-22 this morning at a school (me and a close circle of 200 "helpful" kids in the cafeteria!). First I did a 25 cent pitch raise and was getting a little frustrated at the piano rocking back and forth with my tuning lever motion. Started the tuning pass by tuning A3 to the Verituner. Tuned it between 0.0 and 0.5 cents sharp. Realized I was not about to tolerate all the rocking during the tuning, so I wedged a tapered felt mute under the front treble caster. That steadied things. Went back to A3 and was quite surprised. A3 was 3 cents flat. I just had to check this out further. Removed the felt wedge from under the caster and rocked the piano back and forth gently and the piano was back up to pitch! Put the wedge back and sure enough, it was flat again. I realize this has been addressed many times on this list, but I had never observed it. I also figured any pitch change related to the way the piano was supported on the bottom would most likely be a slow-occurring phenomenon. I will definitely give piano movement more importance in future piano moving situations. Terry Farrell
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