The TooLoud! app is ideal for the teacher who needs to limit noise in the classroom environment. It records decibels, displaying the volume levels in numbers. Use it to let the class know when they cross the auditory line. Hook your iPad up to the projector and manage the working noise level in class by letting the students see the feedback for themselves.
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If the clip is on Table Voice, then only the members of their table should be able to hear their voices. Teacher Voice is their louder speaking voice. This is generally the voice they use when they are reading or sharing with the class.