thanks to Gangrel
for the idea of changing music

this is the download link
http://www.2shared.com/file/KVHl3OHn/GMN.html
after you download the file
go to

program Files/SD EnterNet/NAVYFIELD/SOUND

and make a copy of GMN.cxf in a safe place

then replace GMN.cxf with the file you download it