sentences:  The heart of the automation was an 8 x 24 telephone stepping relay which controlled two reel-to-reel tape decks, one twelve inch Ampex machine which provided the main program audio and a second RCA seven inch machine which provided "fill" music.The tapes that these machines played were originally produced in the MWF's Madison, Wisconsin production facility by WSJM Chief Engineer Richard E. McLemore (and later in-house at WSJM) with special sub-audible cue tones used to signal the end of a song.The stepping relay was "programmed" by slide switches in the front of the two relay racks which housed the equipment.