When on pc: 0 noise from xbox players however you can hear people on pc in game chat ....however all the xbox players hear you as a robot which can be problomatic if you play on xbox and pc do to muting.
The only way to talk to a xbox player from pc is to private chat.
I've just been making a party with the xbox I have and using the mic from that to talk to people. I just tk it at the beginning of the round. A cool biproduct of this method is that I get to dump all the money from the xbox into the pc and buy all kinds of stuff.