How to Fix the MP3 Player
From Obsidian Conflict Wiki
Original tutorial made by videooven.
Explanation
After select in the main menu the "MP3 player" option, and select the song, this will not be played, and the console will be filled with message errors about the missing file of the song.
Procedure
To fix it, go to steamapps/sourcemod/obsidian/resource folder. Open a file called "mp3player_db.txt" with Notepad++. Press crtl+H for deploy the "replace" window. In "find what" type "fromgame 1", and in "replace with" type "fromgame 0". Press "remplace all" and save the changes.
From now on, the MP3 player will be work after you open it, select and reproduce a song.
Video tutorial
http://www.youtube.com/watch?v=xIHtqm43jHc&feature=player_embedded#at=95