Reverts looping delta alert noise (#21854)

code/__DEFINES/sound_defines.dm

@@ -9,7 +9,6 @@
 #define CHANNEL_ENGINE 1017 // Engine ambient sounds
 #define CHANNEL_FIREALARM 1016 //fire alarm alarms
 #define CHANNEL_ASH_STORM 1015
-#define CHANNEL_DELTA_ALARM 1014
 
 #define USER_VOLUME(M, C) M?.client?.prefs.get_channel_volume(C)
 

code/__HELPERS/unsorted.dm

@@ -2052,8 +2052,6 @@ GLOBAL_DATUM_INIT(dview_mob, /mob/dview, new)
 			return "Fire Alarms"
 		if(CHANNEL_ASH_STORM)
 			return "Ash Storms"
-		if(CHANNEL_DELTA_ALARM)
-			return "Delta Alarm"
 
 /proc/slot_bitfield_to_slot(input_slot_flags) // Kill off this garbage ASAP; slot flags and clothing flags should be IDENTICAL. GOSH DARN IT. Doesn't work with ears or pockets, either.
 	switch(input_slot_flags)

code/controllers/subsystem/SSticker.dm

@@ -400,7 +400,7 @@ SUBSYSTEM_DEF(ticker)
 					flick("station_explode_fade_red", cinematic)
 					SEND_SOUND(world, sound('sound/effects/explosion_distant.ogg'))
 					cinematic.icon_state = "summary_selfdes"
-			stop_delta_alarm()
+
 		if(NUKE_SITE_ON_STATION_ZLEVEL)
 			// nuke was nearby but (mostly) missed
 			if(mode && !override)
@@ -430,7 +430,6 @@ SUBSYSTEM_DEF(ticker)
 	//If its actually the end of the round, wait for it to end.
 	//Otherwise if its a verb it will continue on afterwards.
 	spawn(300)
-		stop_delta_alarm() // If we've not stopped this alarm yet, do so now.
 		QDEL_NULL(cinematic)		//end the cinematic
 
 

code/datums/looping_sounds/looping_sound.dm

@@ -130,12 +130,3 @@
 	. = ..()
 	if(decrease_by_amount && decrease_to_amount && decrease_to_amount < volume)
 		volume = max(volume - decrease_by_amount, decrease_to_amount)
-
-/datum/looping_sound/decreasing/delta_alarm
-	mid_sounds = 'sound/effects/delta_alarm.ogg'
-	volume = 50
-	mid_length = 80
-	decrease_to_amount = 10
-	decrease_by_amount = 5
-	direct = TRUE
-	channel = CHANNEL_DELTA_ALARM

code/modules/client/preference/preferences.dm

@@ -88,7 +88,6 @@ GLOBAL_LIST_INIT(special_role_times, list( //minimum age (in days) for accounts
 		"1017" = 100, // CHANNEL_ENGINE
 		"1016" = 100, // CHANNEL_FIREALARM
 		"1015" = 100, // CHANNEL_ASH_STORM
-		"1014" = 100, // CHANNEL_DELTA_ALARM
 	)
 	/// The volume mixer save timer handle. Used to debounce the DB call to save, to avoid spamming.
 	var/volume_mixer_saving = null

code/modules/security_levels/security_levels.dm

@@ -24,9 +24,6 @@ GLOBAL_DATUM_INIT(security_announcement, /datum/announcer, new(config_type = /da
 		if("delta")
 			level = SEC_LEVEL_DELTA
 
-	if(level != SEC_LEVEL_DELTA)
-		stop_delta_alarm()
-
 	//Will not be announced if you try to set to the same level as it already is
 	if(level >= SEC_LEVEL_GREEN && level <= SEC_LEVEL_DELTA && level != GLOB.security_level)
 		if(level >= SEC_LEVEL_RED && GLOB.security_level < SEC_LEVEL_RED)
@@ -98,14 +95,13 @@ GLOBAL_DATUM_INIT(security_announcement, /datum/announcer, new(config_type = /da
 				var/temp_sound = GLOB.security_announcement.config.sound
 				GLOB.security_announcement.config.sound = null
 				GLOB.security_announcement.Announce("The station's self-destruct mechanism has been engaged. All crew are instructed to obey all instructions given by heads of staff. Any violations of these orders can be punished by death. This is not a drill.","Attention! Delta security level reached!",
-					new_sound = null,
-					new_sound2 = null)
+					new_sound = 'sound/effects/delta_klaxon.ogg',
+					new_sound2 = 'sound/AI/delta.ogg')
 				GLOB.security_announcement.config.sound = temp_sound
 				GLOB.security_level = SEC_LEVEL_DELTA
 				post_status(STATUS_DISPLAY_ALERT, "deltaalert")
 				update_firealarms()
 				set_stationwide_emergency_lighting()
-				delta_alarm()
 				SSblackbox.record_feedback("tally", "security_level_changes", 1, level)
 				return
 
@@ -227,23 +223,3 @@ GLOBAL_DATUM_INIT(security_announcement, /datum/announcer, new(config_type = /da
 			L.fire_mode = TRUE
 			L.update()
 	update_firealarms()
-
-/proc/delta_alarm()
-	var/station_z = level_name_to_num(MAIN_STATION)
-	var/list/mobs_for_alarm = list()
-
-	for(var/mob/M in get_mob_with_client_list())
-		if(M.z != station_z)
-			continue
-
-		mobs_for_alarm += M
-
-	var/datum/looping_sound/decreasing/delta_alarm/alarm = new(_output_atoms = mobs_for_alarm, _direct = TRUE)
-	alarm.channel = CHANNEL_DELTA_ALARM
-	alarm.start()
-
-/proc/stop_delta_alarm()
-	for(var/datum/looping_sound/decreasing/delta_alarm/alarm in GLOB.looping_sounds)
-		for(var/mob/hearer in alarm.output_atoms) // Immediately stop the alarm for anyone who can hear it.
-			hearer.stop_sound_channel(CHANNEL_DELTA_ALARM)
-		qdel(alarm)