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BDW,
If all you are looking for is to have a working jeroen wijering MP3 player within XOOPS you can put one in a block or an empty module. I have them both ways at
http://churchthatcares.org. The video player on the front page is a jeroen wijering FLV player. I have about 4 more players (mp3 and flv) once you log into the site.
If you could ever get the player working then adding it to XOOPS is easy. Format it just like you would to add it to any html page, then past it into a block.
It seems like the first time i used it i had the same problem. I think the fix was to change the names of the directories from anything that says mp3 (for example change flash_mp3_player to flash_music_player). For some reason it doesn't like that.
The module is a great idea and i am sure it will be great when it is finished, but if you only want 1 player you don't need a big module.
-Matt