monitoring

Hi guys, I am using OBS for a live performance of small rock/pop choir. It handles multi tracks with backing tracks and video projection. My problem is now that I want to use mutliple soundcards for backing track and sync click. Since now I used monitoring option to just put the track audio...

I am missing a feature, something like this: https://www.tuttidecor.co.uk/wp-content/uploads/2016/05/42826_2-lit.jpg It would be used to prevent embarrassing situations when somebody walks into an office while you are streaming and loudly says something inappropriate. Or embarrassing situations...