Ok, so i currently own the astro a40 gaming headset and mix amp and i’m planning on replacing this setup with a pair of AKG 702’s the problem i am facing is that with the mix amp i am currently able to have two audio inputs with separate volume controls, this is extremely convenient for Skype and game volume on the separate channels. However i have no idea what to look for to replace this with as the astro mix amp is the only device i can find that does this. Any suggestions?