Back Words & Forward: Champlin's Oldies KZLS/Oklahoma City flipped to Classic Country late yesterday (9/29). The station, now known as "99.7 Hank FM," comes with a call letter change to KNAH (Hank, backwards) and is running the Hank FM format from Envision. "When we were looking to fill the hole in the Oklahoma City market, Hank FM was the logical choice," says GM Kevin Waltman. "The team at Envision and Hank FM ... is providing the music, logs, imaging, logo and everything we need to make the flip including the local research needed to keep Oklahoma City listeners engaged."