Hi, this phainonemon has a name in german, called *reiter* which means rider. Probably because one string rides on the other. Mostly it causes tuning-problems, but not allways too heavy. A few weeks ago i tuned a piano with riders, and it was the first time i stopped tuning because it was really untunable. The strange thing was: it looked like the most pianos with riders i know. I thought (like allways): hhmmm, perhaps a liitle bit more difficult to tune, but tunable. I didnīt find the reason why that specific instrument wasnīt tunable. Gregor Germany
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