Need Help With Audio Mod

[Steve3596]

I have an MP3 of Ronan Tynan singing God Bless America, something he does regularly during Yankee Games. I want to make it the song the game plays regularly at the 7th inning stretch. I downloaded someones mod that has the YMCA played at the 7th inning stretch so I know it can be done. I have my clip of Ronan and I cut it down to 30 seconds, I converted it to asf and I edited the C:Program FilesEA SPORTSMVP Baseball 2005dataaudiocdrallyrallydat.big file to have the ronan version as the final file in that .big . This is what I did for the YMCA version and It worked. I edited the Ronan file so that it is the same number of bytes as the original when I replace it, (its the only way the program will allow me to replace the file) but when I look at it the YMCA file is larger than the Ronan file in KB but when I replace the file through AsfImpExp it says it has the same number of bytes, but when I play MVP it just plays nothing at the 7th inning stretch. When I did it with the YMCA it worked, I just want to make it play God Bless America. I hope I gave enough information for someone to understand my problem. Thank you in advance.