Purchased a Mustang Pro last week & loving it! My question is > in layman's terms < how do you download new songs to replace songs within each mode? Since a few that are very fitting to some of the modes, is it possible to keep one or two within the original gameplay? I am not electronically tech savvy & would like to understand in the simplest of terms possible. Do I need to apply new songs with a memory stick or MP3, etc.???