Tom Tancredi :
Not via USB NO. Via the 3.5mm jacks, possible but really not sure WHY you would want to at the same time?!?!
...I play on the PS4 and use the party feature a lot. But, I do also play very frequently on PC while still being on PS4 party for chat reasons, therefore I'd like to have a solution that allows me to play sounds from the PC while playing but still being able to chat over PS4.
Regarding your solution, what about taking a male-to-male jack from PS4 audio out to PC out in, then another cable from PC out to headphone? Shouldn't I be able to configure a playback from audio in to out + the PC sound to the same out as well? What do you think?
I'm leaving mic out of the discussion as I can handle it in a different way.