Ringing noises in the front Duplex can be solved with proper voicing. this works for every piano with this system. Steinway, Yamaha, etc. A good description of the procedure is given in the instruction guide from Renner USA. Written by R. Baldassin. The design of the duplex is not meant to have felt braided in. So try the correct voicing procedure first! Succes. Cyrillus Aerts UNT
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