mmmmmmmmmmmmmmm 2 things come to mind!
My Felix is like this too, very vocal. Very loud and always chatting away, so maybe its just the way your lad is, he like a good natter!
second thing..... father in laws cat Archie kept doing this and eventually found that he had very bad teeth problems, after having infected ones removed he seems ok, apart from now Archie doesnt know where to place his tongue and it keeps making an apprearence!