Tee-hee.
Where I live I have neighbours close, so I have to train Storm to be quiet, if someone comes to the door mostly she just does a quiet, muffled woof, looks at me sheepishly, and is then quiet
I just whispered quiet to her if i heard something, and praised her no end if she didnt bark loudly, or was quiet quickly. (Helped to have a heap of treats handy) Maybe you could do a similar thing, keep exposing him to the noise, and work to make him quiet?
Storm howls if that Britney Spears 'Toxic' song comes on the tv/radio. First time she heard it, she grumbled and barked because she didnt like it, and I have kind of encouraged her becuase I approved of her taste in music, bad me
sportsmonki