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Main menu music.

ENDER_LILIS part of BGM replace main menu music, wav transcode 320kpbs.mp3, -6LUFS.

Catalog.
002_ENDER_LILIES_OST_-_Prologue
037_ENDER_LILIES_OST_-_Main Theme_Piano Edit
039_ENDER_LILIES_OST_-_Harmonious_Save
047_ENDER_LILIES_OST_-_Harmonious_Inst
049_ENDER_LILIES_OST_-_ENDER LILIES

① It is recommended to unpack and extract and replace the original local game files (Steam right click L4D2 to browse local game files).
Default directory reference for the original files → C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2\sound\music\l4d2
Should be looking for it, right?

② After overwriting and replacing, enter the game with the console and enter the reload audio library code (snd_rebuildaudiocache) to solve the problem of incomplete playback (note that you do not need to remove the update folder and then transcode, and character voice replacement is not the same).

③ finally quit command to exit → remove this Mod subscription → re-enter the game.

④ in-game audio settings recommended with 5.1 channel, and the game volume and music volume to the maximum, or you may not hear, this is L4D2 problem do not blame me.