I had this same problem. I fixed it by overwriting the sounds.dat file in the Data subfolder with the one from Gettysburg.
If you don't have Gettysburg or another game that works, here is the contents of the sounds.dat file from Gettysburg. Use Notepad or another editor like Notepad++ to open the file and overwrite the contents with this: 5 0 0 0 0 0 0 0 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 3 7 7 7 0 0 0 7 0 7 0 0 6 0 0 0 0 0 0 0 0 4 0 0 0 0 0
_________________ WDS: Antietam, Chickamauga, Gettysburg, Overland
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