Turn you caps off that is shouting.
Your drive belt is too loose you should only be able to twist it 45 degrees when grasped half way between the pulleys. When you adjust it measure from the center of the swing arm bolt to the center of the rear axle. Both side should measure the same and if you can only twist the belt 45 degrees it is adjust correctly. Don't worry about getting the belt to track in the middle of the rear pully it will never stay where you put it. BTW