You can take your fingers out of your ears now. Since 1998 the folks at NSU's Radio X have made the local airwaves safe and, yes, sound, for the discriminating listener. Radio X, South Florida's only FM college station, has a lot riding on it. If it sucked, listeners craving alternative and local music would be out of luck. Fortunately the nightly program is chockablock with DJs such as Jenocyde (Jen Birchfield) who spin a musical mishmash that reflects their own unique preferences. Jenocyde's show (which airs Wednesday, Friday, and Saturday nights at 7 p.m.) has an unpredictable but always rockable play list that includes Radiohead and Rocket from the Crypt. This is one DJ whose nickname fits. She kills it.