How Do I Fix Those "Buzzing" Bars?
from the Elementary Classroom Teacher Resource Index

If your Orff instrument is "buzzing" when played, there are two possible reasons. The problem could be either the bar or the resonator box. Here's how you can check it out. First, move the buzzing bar to another spot on the resonator box. If the bar still buzzes in its new spot, the bar might need to be replaced. If the buzzing bar does not buzz in its new spot, then the seams on the resonator box probably have dried out. To fix this problem, run a bead of wood glue along the seams of the box and let it stand until it is dry. When the seams are dry, place the bar back in its original position and try it out.

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