So that the Community can help you better, we will need to know exactly which Canon camera model you're using. That, and any other details you'd like to give will help the Community better understand your issue!
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The Headphones icon must appear on your camcorder's display for you to be able to monitor the sound while you're recording. Here's how to set up the terminal for your camcorder:
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.