Here is our set up:

Spark on a shoulder mount camera that connects Via WiFi, has 2 XLR inputs. One XLR is for interviews or room sound. The second XLR is tied to a lav mic on me. I want them both hot back to switcher but on default B channel. Then when needed TD can hit the master button in vMix and go to Program Out. This lets me at the camera communicate with him 90% of the time. I have that figured out, still testing but I have done all the pieces before so should be easy.

Next, I need to hear him(TD) on camera and see Tally light.

If I use standard Tally in Web controller and mount my iPhone on the rig where I can see it, then my phone will always be on and connected to Wifi.

Question - How do I put b Bus with me ducked out to an NDI signal? and then simply have 2 tabs open in Chrome on my phone and a headset. So I need a way to get his mic back to me via a web interface that stays open in Chome?

Thank you in advance for the help.