Not to be negative but what is with the belt obsession? It's never going to be quiet.
I will disagree with this statement. When new, our angle drive started out with quite a bit of whine, but has become quieter as the miles are accumulated. When the belt was not properly adjusted it would whine like a banshee, I mean, needing earplugs loud while accelerating. Now when properly adjusted and clean, there is little to no noise associated with the belt alone.
Bill