Hi there! There's no way to delete it but the "sound" option so I would suggest just lowering that for now.
I could have sworn we coded it to have it be connected to the "voice" option slider, but I may be getting confused with other games of mine.
Still, you're not missing out on any other "important" sounds-- the only other sounds in the game are the sound effects at the beginning of the game and nothing else. After a certain point, all you have is music!
Also, sorry I didn't reply to this sooner-- I don't get notifications for this game right now.