How to switch between HDMI and Headphone

[AlbanRampon]

Hello,

It depends on the product and how the manufacturer has configured the chip.
Some products have a headphone and a line out jack:
- Headphone usually disable the audio output on all monitors
- line out keeps the audio output on other outputs.

Windows hasn't allowed to play the same content simultaneously to several devices, so they are all playing by default. (That, and presenting 3 video, 2 jack outputs would be overwhelming).

Kind regards,
Alban