Xcom enemy unknow soundtrak battle scape

[shadics]

Sometime ago, i edited the xcom enemy unkown 's soundtrack. I use it in my gameplays, and i will put them here, if someone is interested 

[Amiga]

Sometime ago, i edited the xcom enemy unkown 's soundtrack. I use it in my gameplays, and i will put them here, if someone is interested 

Can you provide small tutorial how to replace it?