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You will need the remote to adjust audio.
Sorry, there was a problem. Please try again later.Hi there, Thanks for asking. To adjust the volume, please press the left and right arrow keys to turn down and up the volume when under HDMI, VGA or AV connection. When a USB drive is connected to the projector, please first select and play a video from the drive and then use the arrow keys to adjust the volume. - Vankyo Support Team
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