Something is wrong with the audio output. I'm at the start where the MC has just made it home, and the rain sound is incredibly loud. Muting all mutes the rain sound, but it doesn't change with any of the audio volume sliders. Did you assign the sound effects to any audio channels?
Hey there! Hmm, I haven't coded this game in a while, but if memory serves me right, I might have created separate channels for looping background noise/music on certain points, which would not have a control in the renpy menu. Sadly, im out of the country for a month due to a family emergency, so im a bit limited in what I can do, but maybe i could do some sort of quick fix for you if I can; which OS are you using (Windows, android, apple, or linux)?
(If its apple or linux, it might be a bit harder for me to fix, but ill definitely try)
Of course, I understand that :) So, as I mentioned, I'm out of the country, so I'm not in a situation to change the source code, but I did make a quick fix for you:
Step one: Download this file from Dropbox (download button is on the top right corner)
Link: https://www.dropbox.com/scl/fi/fsfnlpb1z3fmojcc5jj4b/options.rpy?rlkey=n92zn9zg0...)
Step two: Move this file to the game folder (...\ValentinesRain-1.0-pc\game). When it asks to replace the file, click yes.
This will attach all the looping channels to the music slider in the preference screen, so you will be able to control the sound that way, in game.
Hopefully this fixes it! Once I'm back home, I'll try to look into updating the game (there's a few other fixes I have in mind for it). Let me know if you have other questions =)
Drac