It doesn't happen often in the vanilla game due to the lack of NPCs travelling in and out of both Freeside and the Strip, but with mods like NV Strip Overhaul and NV Uncut: Freeside Open, NPCs keep on triggering the gate sound which was obviously intended only for the player judging by how loud it is. Are there any mods out there that fix this issue? It's getting really annoying, and these two mods are absolutely must-haves for me.
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