Monkey Barrel, EdinburghIn an uneven show, one of the most intriguing comic voices of his generation tackles sex, race and British identity 'I used to be a cool young comic with cool young fans," bewails Jamali Maddix. He's certainly one of the most intriguing, though not perfectly formed, comic voices of his generation, with little by way of filter and never one to be swayed by on-message orthodoxy. He may now be mo…