I basically set up a bandcamp just for this and The Heart Pumps Clay's soundtrack since I got a couple of requests for mp3s, and they're saved as .oggs in the game itself. A Very Long Rope just has a midi soundtrack, so I don't plan on uploading it; you can just pull the files directly from the music folder. That said, they'll sound a bit drier outside of the game since VX automatically puts a bit of reverb on midis (which generally makes them sound a lot better to my ear).