H400 and HA400 4 Master input

I have questions about the master input on the H400 and HA400

Can I use 3 inputs on the master at the same time? For example on the Up2stream you cannot use optical and coaxial at the same time. Is this the case with the HA400?

What if I use the optical from a video source like Android TV box? Would the video and audio stay in sync?