Can anyone share a detailed guide on how to make an Easter egg on the Call of the Dead radio?thus, when approaching the radio and using it, a voice message occurs(for BO1) (изменено)
[14:15]
only not in a nutshell, the manual is clear

radio_ee()
{
    radio = GetEnt("radio", "targetname");
    trigger = GetEnt("radio_trigger", "targetname");
    trigger waittill("trigger");
    radio PlaySound("random_sound");
    trigger Delete();
}

It's been over a year since i havent touched anything modding related lol, but i think this script is all you need to play a random sound that you have. In radiant just make a script mode and give it a key "targetname" and value "radio". Make trigger use, give it a "radio_trigger" targetname and thats it. Just call this function in mapname.gsc