this is perfect for making my game seem like 4 combine units running around a run down city fighting off hordes of xen infected civs. thank you for making this

It's possible but i encourage you to look on l4d2 guides and on google how to open VPK and edit sound files.
In the sounds files of l4d2 you have sounds called zombiechoir01....zombiechoir02....etc
These sounds play when you are close to unnatracted zombies.
Pick and download any police ..etc sounds, open the first zombiechoir01 sound in audacity ( easy to learn ) , open under this track your new sound, cut it to match the same lenght, boost volume if needed and keep it at 441000 hz ( if i remember ) then save as WAV.
When you ahve all the sounds replace them in my vpk , and make a vpk again then put it in addons.
you need vpk.exe ( source sdk 2007 ) , gfscape , audacity

You think you could make a generic version, with like gunfire, police and ambulance sirens ?

thanks

it replace zombiechoir files only in folder l4d2-sounds-..etc

does it also replace l4d2 sounds?

the division hud

what hud is that?

dang, you got me

As writen in description :)

some of those are from half life 2, you cant fool me!

i will continue, i'm just taking a motivation break from it, i need ideas and time

Awesome!

Minor Question: Will you ever be continuing the Mutation 2.0 Infected or is that the final product?