Split audio between two sources simultaneously

[LONESTORMER]

I am currently trying to set up a second PC to be my streaming PC. Everything is working perfectly fine and as intended, the only issue is audio. I need to change the capture card to be my PCs default device, but when I do that I don't get any audio coming through my headphones but it does get picked up by my capture card. Then when i make my default device my headphones again the capture card doesn't get any audio but I do. I simply don't know a way to split the audio so that both sources have audio being played at the same time. Any help would be appreciated.

[themctipers]

use a 3.5mm splitter (1 input 2 outputs), one to your headphones and the other output to the input of your streaming pc

[LONESTORMER]

2 minutes ago, themctipers said:

use a 3.5mm splitter (1 input 2 outputs), one to your headphones and the other output to the input of your streaming pc

I would but I'm using a Astro mix amp for my headset which is USB not 3.5. Also, i need the audio to be split on my original PC because of the delay from the capture card