I decided to take the time myself to work on this. For fox, it looks like the middle innings you can just use that teams middle inning music and run it as broadcast, but for end of innings they dont actually use an "outro," they just use the intro and fade it out. I have fox just about done (postseason fox, fsn is already done), now i just need to figure out TBS and ESPN.
EDIT: Looks like TBS is the same, so I have TBS about done already.
ESPN EDIT: It seems like ESPN modified its typical theme so I'm going to need some help to get that done.