I have a problem, when I'm in first gear you hear a buzzing 
especially when driving at the same speed or when you 
release and add gas. I have a video clip and I hope it is 
heard.Does anyone know what the problem is?

 

 

 

Aloo

 

I can only hear a faint metalic clanking - which could be either a failing brake dust shield or an exhaust knocking.  For the former, you have to take off each wheel and check what the state of the shields are like - if they are rotten, they need replacing.  For the later, I suggest that you check the rubber hangers and see if there any loose of missing.