IIRC, a lot of those have INI files where you can turn on/off features I would check the Description page for each of those, and see what setting (If any) the Description page has listed for what you can toggle in the INI file. I'm thinking it could be Frontier, because i t's the newest mod, and I've used a lot of those other mods, and don't remember some annoying sound I've searched through all the INI files and unfortunately haven't found any options that sound like it, so that's the conclusion I'm coming to as well. It must be a feature or something added by The Frontier, because it doesn't seem likely that any of my other mods would be causing it. I guess my next course of action is going to be disabling mods one by one until I find which one removes it, hopefully that works. If not, or if it turns out to be added by The Frontier, I'll just have to go ask about it on the comments of the mod page. Thanks for the help anyways, even if it didn't turn out to be the solution. Try loading up the Frontier INI files in a text editor and searching for something like SOUND or NOTIFICATION or QUEST etc.. I searched through all the INI files added by The Frontier, oddly enough it doesn't add any into the NVSE plugins folder despite having a .dll, but I checked the ones elsewhere. Not options for it in any of them, but when I did try disabling mods to see if that would help me find the mod causing it, I tried The Frontier first and it went back to the vanilla sound. So it is added by The Frontier, I just can't find an option to turn it off. So I went ahead and posted on their comments about it, so I guess I'll just wait and see if they have a way to turn it off or if I'll just have to deal with it if I want to play the mod.