You all may already know this, but in case you don't, you can listen to minor league teams radio broadcasts of their games on your computer at this website:
http://web.minorleaguebaseball.com/milb/multimedia/audio.jspThese are free and you usually have a choice between the home team broadcast and the visiting team. Last year I went to Woodbridge to see Patterson's 2 rehab starts with the P-Nats, but listened to the one in New Orleans. Just remember that these are minor league teams and minor league announcers - though the P-Nats announcers (class A) were better than New Orleans (class AAA). Also you don't have to listen on the day of the game, they are archived so you can hear them later if you wish.