Please help about output!!

Each time I open cubase the sound that playback in background like youtube it’s muted, Now i use output 1/2 and 3/4 four output cable 1/2 for main sound like windows and youtube The 3/4 for daw. is this a coreect way ?

I don’t know about the correct way since we don’t know what sound card/audio interface you’re using.

If you wish to use the same outputs for Cubase and other programs whilst Cubase is running you need to tick the box marked
“Release Driver when Application is in Background” from within the VST Audio System page of the Studio tab.