code/game/machinery/announcement_system.dm 
| /proc/get_announcement_system | Returns a random announcement system that is operational, has the specified config entry, signal can reach source and radio supports any channel in list. All args are optional. |
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| /proc/aas_config_announce | Announces the provided message with the provided variables and config entry type. Only aas_config_entry_type and variables_map are mandatory. Other args are optional. |