NEGIMAN4'S PROFILE

I saw that RPG Maker VX Ace supports looping oggs but for the life of me I cannot figure out how to "tag" something on an ogg or whatever. Am I missing something totally obvious? I've searched the net and I can't seem to find what i'm looking for. I want to loop some BGM in the right place so it doesn't start all over again.
Is it really that difficult and complicated? Or am I just retarded? :/