alright alright lemme post what i know(here google will be your best friend, cuz i dun have download links)
first, you'll need a couple of things.
1. a .rar unpacker(use winrar, google it)
2. a .mrs unpacker(google it)
3.music you want in the game
you need
-lobby music
-character select music
-game end music
-7 in-game songs
4. an mp3-ogg converter(google it)
alright, now first get everything. next, you'll need to convert all your music to .ogg format. make sure it plays correctly before going on(otherwise you'll have silence in-game)
next, you'll need to rename the music to the following
Fin.ogg (End song of game)
El-tracaz.ogg (In-Game song)
HardBgm3 Vanessa Retake(D).ogg (In-Game song)
HardBgm(D).ogg (In-Game song)
HardCore(D).ogg (In-Game song)
HardTech(D).ogg (In-game song)
Industrial technolism.ogg (In-Game Song)
Ryswick style.ogg (In-Game Song)
Intro Retake2(D-R).ogg (Character Select Song)
Theme Rock(D).ogg (Lobby Song)
it is case-sensitive, so copy these down word for word.
next, create a folder titled BGM and put your music in it. then copy the folder and put it in your mrs compiler/decompiler folder. then, compile it with your program. next, copy your original BGM(the one that game with GunZ) and put it somewhere safe. now put your new BGM in the sound folder for GunZ. run GunZ, and listen to your favorite tunes.