Please help

[XpectoPatr0numTTV]

Hello all ok well i am having a problem with a mod it's still playing yet i no longer have it the mod is for l4d2, it's a theme song for the tank. I want to put a new one i got, yet when i do the old one still plays and am not even subscribed to the mod that was my last resort. All i want to do is play my new mod, and i can't cause when i look at my add ons my new one is white basically telling me it's working but not when am in game.

So please help me if you can thank you.