Flat Duo Jets is the vehicle of one Dexter Romweber, a North Carolina blues boy who's spent about a third of his 23-year-old life playing with his band. His burst of fame came in the 1986 documentary on the Athens, Georgia, music scene: Athens, GA./Inside-Out. Romweber, a bristling and uncontrollable on-screen presence, nearly ran away with the movie--and he'd only been passing through town to boot. The wildman guitarist is part preacher, part seeker, and does three things: fast blues, slow blues, and novelty instrumentals, ("Sleepwalk," "Harlem Nocturne"), each of these shot through with a rockabilly sensibility and all (except the instrumentals) benefiting from his rich, resonant voice. The other two members of the threesome (it used to be a duo; the name, Romweber says, came from an old Gretsch guitar model) just stay out of his way. The four years since Athens, GA. haven't made him a star, but he does have a new recording contract with (R.E.M. manager Jefferson Holt's) Dog Gone records, out of Athens. Worth seeing. Wednesday, 7:30 PM, Cabaret Metro, 3730 N. Clark; 549-0203.