Panasonic LUMIX DC-GH6 Owner's Manual page 413

Video Settings – Main Assist Functions
Adjusting the Test Tone
There are 4 levels ([−12dB], [−18dB], [−20dB], and [MUTE]) of test tone to
select.
Rotate ,
•
The color bars and test tone will be recorded on the video if video recording is
started while the color bars are being displayed.
•
The brightness and coloring that appear on the camera's monitor or viewfinder
may differ from those that appear on another device such as an external monitor.
or to select the test tone level.
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