Epson ELPMC02 Guide De L'utilisateur page 12

5. If you need to adjust the volume, use your external audio device's volume control.
Note: If your audio device doesn't have a volume control, you can use the
microphone Gain control wheel to adjust the volume from your external audio
device. The Gain control wheel also affects the volume of your voice when using
the pendant microphone. You may need to readjust the microphone sensitivity
when you're done playing audio from the external audio device.
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Getting Started