sentences:  Rather than continue to simulcast, WMUS-FM separated programming and adopted the new call sign WFFM.In a "storecast" arrangement with Hasper's, a local grocery-store chain, WFFM aired instrumental easy listening music in monaural sound, interspersed with promotional announcements about Hasper's.The WMUS-FM call letters returned to 106.9 in 1970 and the station resumed its simulcast of the AM's country format.