Depends on what you've done to that point. If you've gotten the item(s) in the map with the shadow, you need to go to the first house. If you haven't, you need to get those item(s).
The strange sound is a consequence of not having the time/energy to learn how to properly learn the music and sfx related side of GBStudio lol. Had some good ideas, then hit the brick wall that is trackers and the Gameboy's specific sound file requirements (more specifically, GBStudio's).