 97.3 "The Sound" launched ichannel.fm's broadcast as a sub channel (HD-2) on their HD Radio signal near the end of August 2008.In late May 2009, that format was dropped and 'Mormon Channel', a Christian talk and teaching station, took its place on the HD2 channel.After having a construction permit with the call sign WAAR, the station changed their call sign to WMMA in June 1993, and would sign on in January 1994 with an oldies format.