I'm new here. Just got rocksmith and have been following the basics to get songs. The issue I'm having is when I go to download certain songs, there are 4 or sometimes 8 files to pick from. Do I download m.psarc or p.psarc? I can tell the others are for consoles so I don't need them, but I don't know the difference between these two. Thanks for any help in advance! ^-^