If you're recording on your PC it'll record with your game audio(Not the best quality though), but if you're recording a console or something you'll need to record the system audio of your PC using another program as you play. Most people sync together (the good ol' 3, 2, 1 CLAP) and then send their audio to each other for better quality. Other people may know a better way than me but that's what I've been doing so far 