I have this setup where I have a monitor dedicated for my console (ps4) that I use along side my pc and I have a male to male line-in which I use to listen to that audio. The only way to manage the line-in volume is through the volume control panel or the soundcard control panel. Would be nice to have it if line-in is found to show up like other audio inputs.
My soundcard is: Sound Blaster Audigy Fx if that's any use.