I don't think I explained it properly, sorry. What I meant was the mod will work on a server or in SP, but the sound detection only has to be for the client-side. If that explained it any better I actually don't know .-.
Does anyone know a way to detect if a certain sound is being played that will work on a server? When googling it the only thing I found was a liteloader AutoFish mod that mentioned sound-based detection in its forum.
Edit: Since they have added Subtitles (I don't know when though, I don't remember seeing them haha) could you use code similar to the subtitles to detect what sound is being played?