A bird singing is a high pitch.) Annie O'Neill, Post-GazetteLangley High School music teacher Nancy Addy: Most of our rooms are not acoustically sound, so the kids are getting pummeled.Click photo for larger image.They are designed to replicate what the ear does, said Gail Gudmundsen, an audiologist and director of sales and marketing for Etymotic, he is basically by turning the volume down.N