How do i get vrchat to use the right audio channel?

So I play in a band and I was thinking about doing a solo show in vrchat for the people who like my music but are far away from me. My idea was this, I’d have my mic in the left channel and my mp3 player with my backing tracks in the right channel. I connected them like so, and on audacity i can get a clear recording of both at the same time, so i know the hardware works just fine. but when i open the device in vrchat, it only seems to want to use the left channel (my mic) rather than the right one as well (my mp3.) is there a way i can get the game to use both of my audio channels? it’s on the same device, it just only wants to use the left channel specifically.