So What Are the South Korean Propaganda Speakers Broadcasting Anyway?

Not much really since the ROK is trying to balance showing action to their domestic audience and not broadcasting things that would upset the Kim regime to where it would make it very difficult for them to deescalate.  The propaganda speakers are also a bargaining chip because the ROK right now is broadcasting little propaganda, but could threaten to broadcast more if things do not deescalate:

The loudspeakers that the military is using consist of 40 or so high-output 500 watt digital speakers that are around 4m by 3m in size. During the day, the broadcasts can be heard more than 10km away in the Kaesong Industrial Complex. At night, the sound carries as far as 24km. At the moment, the messages are broadcast intermittently. North Korea also began broadcasting propaganda into South Korea on Aug. 17. Since North Korea is using antiquated analogue loudspeakers, its broadcasts are reportedly hard to even understand in South Korea. The broadcasts that the South Korean military is sending into North Korea typically are not very political, focusing more on news in North and South Korea, world affairs, and the weather. One female defector from North Korea also takes part in the broadcasts, telling the story of how she defected and talking about her life in South Korea. But the fact that South Korea could use the broadcasts to criticize the North Korean regime if it so chose appears to be putting pressure on North Korea.  [Hankyoreh]

You can read more at the link.