2 issues regarding remote audio

I am using TV on a regular basis since a couple of weeks. I have been using it for almost 10 years, but only on rare occasions. I have 2 issues i cannot solve and hope to find the answers here.

1. Audio gets quieter on host when TV is running and connected to a remote PC. I am listening to internet radio almost all the time and the audio gets moved to the background as soon as i connect to a remote PC. Played around with options, but to no avail.

2. I want to listen to audio of the remote PC, but this audio should be muted on the remote PC. I'm not sure if this is possible at all, since you have to mute the audio output on the remote, which is in this case the audio source as well. Maybe it is possible to set TV as the output source on the remote PC instead of the remote PC speakers? Live testing is not possible, since host and remote are located in different cities. I know, that there is the option "Remote sounds", but does this mute the local audio output on the remote as well?