thanks for downloading this update

to install it
open openIV and enable edit mode
better backup your files first and

go to: C:\Games\Grand.Theft.Auto.V\x64\audio\sfx\ONESHOT_AMBIENCE.rpf\
or C:\Games\Grand.Theft.Auto.V\mods\x64\audio\sfx\ONESHOT_AMBIENCE.rpf\

click with your mouse in the left upper menu of openIV at "new" -> Import openFormats
-> choose subway_announcer.oac and click okay

this should do it.
Enjoy : o )
