Adjust alert level volumes (#9145)

* Finally

* Requested adjustments

Content.Server/AlertLevel/AlertLevelSystem.cs

@@ -173,7 +173,7 @@ public sealed class AlertLevelSystem : EntitySystem
         {
             if (detail.Sound != null)
             {
-                SoundSystem.Play(detail.Sound.GetSound(), Filter.Broadcast());
+                SoundSystem.Play(detail.Sound.GetSound(), Filter.Broadcast(), detail.Sound.Params);
             }
             else
             {

Resources/Prototypes/AlertLevels/alert_levels.yml

@@ -27,20 +27,29 @@
     gamma:
       announcement: alert-level-gamma-announcement
       selectable: false
-      sound: /Audio/Misc/siren.ogg
+      sound:
+        path: /Audio/Misc/siren.ogg
+        params:
+          volume: -2
       disableSelection: true
       color: PaleVioletRed
     delta:
       announcement: alert-level-delta-announcement
       selectable: false
-      sound: /Audio/Misc/delta.ogg
+      sound:
+        path: /Audio/Misc/delta.ogg
+        params:
+          volume: -5
       disableSelection: true
       color: DarkRed
       shuttleTime: 1200
     epsilon:
       announcement: alert-level-epsilon-announcement
       selectable: false
-      sound: /Audio/Misc/epsilon.ogg
+      sound:
+        path: /Audio/Misc/epsilon.ogg
+        params:
+          volume: -2
       disableSelection: true
       color: DarkViolet
       shuttleTime: 1200