Can I Have 2 Audio Sources (PS4 and PC) Come Through The HyperX Cloud II Gaming Headset Using The USB and 3.5mm Jack?

I mean is that I want my PS4 audio coming from that using USB or the 3.5mm jack playing the audio into the headset then I also want my PC audio using USB or the 3.5mm jack coming from that into my headset which then should allow both audio playing into my headset at the same time.

 
The headset only has one 3.5mm jack. It plugs either into the pc's usb dongle or the console.

To get both sources playing simultaneously you need a mixer. Connect the pc's usb dongle onto one input port on the mixer, the console into the another, and the headphones into the mixer's output.
 
So I couldn't just plug in the 3.5mm jack into my PC and plug the USB into the PS4 allowing both audio signals to go into my headset?

 

Oh ok I know all theses questions are really stupid but could I do it vise versa and still have both audio come through my headset like if I put the 3.5mm Jack in the PS4 controller and plugged the usb into my PC would it work or no?