I know it's been six years. But I wanted to give the right answer here. Unity does support WAV loop points, and it's a very reliable way to achieve something vital to your game: having beautiful music with nice intros and looping on a specific part of the song through loop points. Not all wav edition software is compatible with unity though. I've used Wavosaur and it's compatible with Unity 6. I've also heard that tidalwave and other in-editor wav editors are also a viable option to set loop points. Once you set your loop points, all you have to do is tell the audio source to loop, and it will work seamlessly with your loop points out of the box. I hope this is useful to you, or anyone else visiting in the future!!