The most common source of wild and false strings is the bridge pin being loose. A simple test is to put a screw driver on the offending pin and push on it while striking the string. If the wildness disappears or changes it is a loose pin. The best solution is to use thin CA glue to file the pin hole entirely by dripping down the pin and continue to do so until it is full. This is a slow process so go slowly. Second source is duplex scaling where one or more strings are almost matched by an aliquot that produces a beat. Solution is to find the offender and mute it out. On new strings beats can be produced by strings not conforming to bridge and pin. Rubbing down the string all the way to the bridge pin can help. There is a lot of information about this subject in the archives as well. Newton nhunt@jagat.com
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