I'm actually a little perplexed by some of the things you said. For example, when you said the overworld music and the battle music played at the same time? Unless you were using the Soundtrack Layering plugin - which is separate from this one - or some other plugin not by me that affects playback somehow, I have absolutely no idea how that happened. Nor can I guess why MEs seemed not to work, as Soundtrack Manager doesn't do anything special with MEs.