i found this on the dutch forum and did a little translation!! i didn`t test it yet
download hex edit :http://www.hhdsoftware.com/Download/free-hex-editor.exe
download XMBWave.rar :http://www.zshare.net/download/xmbwave-rar-88q.html
read the readme file inside the folder!
1. Open system_plugin_bg_deflate.bin in a hex editor.
2. Go to offset decimal 530 through 716.
3. Mix the characters between those lines. (keep them seperated by 00 (look like .'s)
4. Save this file.
5. Run start.bat.
6. Put the file in /vsh/resource/
just mix some numbers and letters but don`t go to far!! or you will lose your waves