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)