Canon EOS C100 Instruction Manual page 106

Playback
NOTES
• For details on changing the audio channel, refer to Selecting the
Audio Channel (A 117).
106
• If you set an assignable button to [Headphone +], [Headphone -],
[Speaker +] or [Speaker -] (A 87), you can press the button to
adjust the headphone volume or built-in speaker volume without
using the menu.
× (headphone)
terminal
Speaker
(monaural)