Hmm. I can't replicate the issue with the TV volume; mine is muted at lvl 0 even when pc volume is maxed. However, I know of some volume bugs spatially-related to the radio, so if you found or bought one by drone, then that's probably messing with your TV vol.
As to green argemia, no spoilers here, but feel free to ask on the discord server in the Spoilers channel.