My music comes from my laptop. It has a VGA out, an hdmi out, USB out and regular 3.5mm out. I want to bypass my internal amp to send to my matrix m-stage. How do i do this? Also would it sound better to get an amp/dac like the o2+odac or to keep the m-stage and utilize my internal sound card. By the way the headphones i will be using are the Fostex TH-600. Could really use the help!