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I'm not even 100% sure how to use audio loops for ogg vorbis, so I'm trying to figure it out as best I can. I'm using foobar2000. Here's a screenshot of how I'm doing this...
But obviously, it's not looping. What's the proper way to do this?
Your loop point is set to 5 minutes, 63 seconds, but the sound is only 1 minute, 14 seconds long. Your loop would be invalid, but it doesn't even get that far, because you've got too many colons, so it completely ignores the tag.
On the assumption that you mean 5.63 seconds. You should set the tag to ":5.63". If this is so you can have a header that doesn't loop, you also need to use the LOOP_START tag, not the LOOP_END tag.