I just tried the program with Advance Wars - Days of Ruin, and found the songs under a folder called 'sequence.' I know you said the quality was bad, but the songs were nothing like the game sounded ._. Do you know what the data was extracted as? I can't tell myself, but the actual songs seem more like they're being played as MIDIs using the sounds/instruments already no my computer, while in the other two folders, it sounds like the game's internal sounds and instruments are setting alone.
Is there a way to integrate the two or am I thinking about it wrong?