Custom soundtrack was already possible before 2.40 (I don't know which update it was in but it's been there for a few months now). All that 2.40 allows for games with this custom music patch added (It does NOT work for games that have not been patched) is to play music via the pop-up XMB instead of going into the game's menu to change the music (Is longer). So the custom soundtrack issue is not the problem.