Perhaps you're right it's your attention he wants. I have 3 cats and one of them is extremely vocal. When she wants me to brush her (and if I stop), when she wants to be cuddled or when she wants to play or even when I'm in a room and she can't get in or generally when she wants my attention she just meows the whole place down (I'm afraid that one day one of the neighbours will report me for cat abuse ). She doesn't do it as badly with anyone else.