Hello, I want to connect TV and PC to my speakers and control the volume of both devices with a knob, I know I can use Mackie Big Knob Passive, but I'm wondering if I can achieve the same result with M-Audio M-Track 2x2M (or newer Air 192/6) as it has two line-in inputs. Will it work if I connect L & R channel output from TV to the inputs in M-Audio and then just switch between PC and TV source with USB/Direct knob?