You will want to slow down and talk about what you are trying to achieve. You may also want to Google up some terminology so that you can talk the basic language of A/V if you are new to all of this.
1. The Opus 300 system with a MCU 300 does not have any digital audio inputs.
2. Most A/V receivers can't handle digital audio to zone 2 so won't be able to provide audio to your distributed audio system using digital only sources (HDMI or optical/coaxial digital).
3. You typically would connect your sources digital to your A/V receiver, and analog to your home audio distribution system.
Here is a picture of the MCU300 if that's what you are using so others are aware. It is a 6 source (with loop through) analog stereo distribution hub with remote IR capabilities.