You are concerned about a delay between the picture and sound.
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If a Bluetooth audio device is connected
The picture and sound do not match because the sound is delayed due to the properties of Bluetooth. You can adjust the output timing of the picture and sound with the A/V sync setting.
If a specific audio system is connected with an HDMI cable
If the audio device is connected with an HDMI cable, the sound may be delayed due to the properties of the audio device. In that case, you can adjust the video and audio output timing with the A/V sync setting.