I have an older Knabe grand with a dead spot in the mid treble section. I think it might have to do with the crack in the sound board. Over half an octave. Sound like it has a set of soft domestic hammers. no tone period. The hammers are striking all 3 strings so IM not sure what to test next to see if this is an easy fix or if the sound board perhaps needs replacement. Can anyone help? RBP
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