That is correct. With 30 team control you gotta sim each game on the schedule first with the injury slider on 6. Then back out....set injury to 10 for your game. Play your game. After you finish your game, go set the injury slider again to 6, advance your day and the radio show will come on.
Also I sim all the games on the days schedule so I can see the score updates in the 2nd, 5th and 8th innings during my game and scoreboard watch. When I sim each game I do not look at the scores....I want to be excited to see if teams I need to win or lose are doing that during my game.
Been doing this....forever.

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