-By Mark Kirby(Entertainment Writer) Rebel Region is ringing off the hook with a fresh sound. Like reggae, but not. Like dance hall but not. It's a sound that is distinctly Caribbean, but from where? Mason, a prime mover of Rebel Region music is as vibrant and as unexpected as his home - Barbados. This island is not nearly as present and influential as it is far away Caribbean neighbor, Jamaica. There are points of contact between the two: the use of soca, dancehall, roots reggae, and the influence of American music, i.e., hip hop. But being not of Jamaica perhaps allows for more diversity than current Jamaican music produces. The cuts vary in flavor: "Move Like Dis" is a dance hall dance party cut; "Ahoy I Hey" is a fast soca-merengue cut with a calypso melody; "Treasure Map" is a slower dance hall song about finding love; "One Wish Upon a Star" lopes along with a roots -dub groove with a hip hop feel. Mason has created a gumbo of Caribbean music. Or perhaps it's a Bajan stew. Q-When did you feel that