Can you lower Facetime volume?

Hi guys!

Here's my question, if anyone knows how to do this, I'd appreciate they shared the answer.

I've been to different forums where the question seems to always be if you can actually mute Facetime by simply clicking on the mic icon that shows on every conversation, but that is not my question. I want to know if you can actually lower Facetime volume (only Facetime) so that you can continue watching videos or movies without the sound from the conversation interferring. Basically the equivalent of opt + cmd + ⬇︎ on Skype

Anyone?

Thanks a lot 🙂

Mariel.