I know how to export the selection and make it a loop, but what I need help with is turning the stereo track into a mono track. I've tried splitting the stereo track and turn the left and right into mono. Also I've tried splitting the stereo track, delete one and turn the other into a mono. But every time I put it into Blockland, it says, "Stereo sound detected in <name>.ogg file, removing datablock." and my add on is gone. Can someone please tell me how to make it a mono track the right way? I guess I'm doing it wrong. Also, if it matters, I'm a Mac user. I've made music add ons like this before on a different Mac but it doesn't work on this one.