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CF出门路程音效//Exiting Saferoom / Enter The Next Area Music replaced by CrossFire challenge mode level begin music

(l4d2 map only！）
The ambient sound of going out was also used as a sound effect for survivors when they entered a new area, so I felt it would be a good fit to replace it with this sound from CF Challenge mode

Why does such a small sound effect replacement file take up such a large amount of memory?this is because there are two parts of the ambient sound played at the beginning of the game, and the number of audio in one of them is as high as eighty-six (this part needs to be muted)... If I continue to replace the music from l4d1, the size of this mod may have to be doubled, which is too exaggerated, so I only replaced the music from l4d2

(This part of the music has the same problem as the main menu music, that is, if it is made at the original volume, the actual volume in the game will be very small, I can only turn up the volume in advance to make it be heard normally in the game, but the volume is too loud to obviously affect the sound quality... The sound quality in the game is the best I can do at the moment-)