If you no longer have audio levels displayed and no audio output when recording, there may be a problem with the microphone setting in your classroom or with the setting within the Garritan program itself. This has detected whether the microphone is running low and assumes that the microphone volume in the audio is not too low. Also, in the Garritan program, make sure that the correct sound source is selected and that the volume level in the program is not too low. If the problem persists after checking the settings, try reinstalling the Garritan program or check for software updates that may solve the problem.