Htc vive pro wireless separate audio

[UnknownLight]

Hello there i have an htc vive pro with a wireless adapter and when my brother playing vr and im using the same pc i dont wanna hear his gameplay or him hearing my audio like me watching youtube how can i separate the two audios so we cant hear each other while using the same pc i have a win10 and im also using a wireless razer nari ultimate headset 

thanks a million from now 😄