Asus VA32UQ 31.5" 16:9 4K HDR Adaptive-Sync VA Monitor - Manual (Page 19)

3-6 Chapter 3: General Instruction
5. Sound
Adjust the sound settings to your preference.
Sound
Volume
Mute
Source
Standard Mode HDMI-2 1080p 60Hz
ASUS VA32U HDR OFF
• Volume: Adjusts the output volume level.
• Mute: Mute the output volume.
• Source: Adjusts audio source to “main source” or “sub source”.