diff --git a/Assets/Scripts/ServerShared/Corporations.cs b/Assets/Scripts/ServerShared/Corporations.cs
index 3b676aef4..e527606d9 100644
--- a/Assets/Scripts/ServerShared/Corporations.cs
+++ b/Assets/Scripts/ServerShared/Corporations.cs
@@ -47,14 +47,7 @@ public class Faction
     [Inspectable, CultReference(typeof(Faction), many: true), CultInspectorRange(0, 1), JsonProperty("allegiance"), Key(12)]
     public Dictionary<CultRecordRef<Faction>, float> Allegiance = new Dictionary<CultRecordRef<Faction>, float>();
 
-    [Inspectable, JsonProperty("overworldMusic"), Key(13)]
-    public uint OverworldMusic;
-
-    [Inspectable, JsonProperty("combatMusic"), Key(14)]
-    public uint CombatMusic;
-
-    [Inspectable, JsonProperty("bossMusic"), Key(15)]
-    public uint BossMusic;
+    // Keys 13 to 15 (overworldMusic, combatMusic, bossMusic) held Wwise ids; retired, never reuse them.
 
     // Key 16 is reserved for Relations (operator ruling faction-relations-field).
 
diff --git a/Assets/Scripts/ServerShared/ItemData.cs b/Assets/Scripts/ServerShared/ItemData.cs
index fe705b4f6..72c07fc9a 100644
--- a/Assets/Scripts/ServerShared/ItemData.cs
+++ b/Assets/Scripts/ServerShared/ItemData.cs
@@ -417,11 +417,7 @@ public abstract class EquippableItemData : CraftedItemData
     [Inspectable, CultInspectorAssetGuid, JsonProperty("actionIcon"), Key(20)]
     public string ActionBarIcon;
 
-    [Inspectable, JsonProperty("soundBank"), Key(21)]
-    public uint SoundBank;
-
-    [Inspectable, JsonProperty("audioStats"), Key(22)]
-    public List<AudioStat> AudioStats = new List<AudioStat>();
+    // Keys 21 (soundBank) and 22 (audioStats) held Wwise ids; audio is native Unity plus AquaSynth now. Retired; never reuse them.
     
     [IgnoreMember]
     public abstract HardpointType HardpointType { get; }
@@ -455,16 +451,6 @@ public abstract class EquippableItemData : CraftedItemData
     }
 }
 
-[Inspectable, MessagePackObject, JsonObject(MemberSerialization.OptIn)]
-public class AudioStat
-{
-    [Inspectable, JsonProperty("parameter"), Key(0)]
-    public uint Parameter;
-
-    [Inspectable, JsonProperty("stat"), Key(1)]
-    public PerformanceStat Stat = new PerformanceStat();
-}
-
 [CultDocument("aetheria.geardata", "1"), Inspectable, MessagePackObject, JsonObject(MemberSerialization.OptIn)]
 public class GearData : EquippableItemData
 {
diff --git a/docs/aetheria-release-map.md b/docs/aetheria-release-map.md
index 3176c3163..87e5beb8c 100644
--- a/docs/aetheria-release-map.md
+++ b/docs/aetheria-release-map.md
@@ -224,9 +224,11 @@ at the same commit.
   stat); `SoundBank` is catalog key 21 (`:403-404`).
 - Gone since B5: the `AetherDrive` audio calls and its `RpmAudioParameter` and
   `TorqueRatioAudioParameter` fields (grep 0), and the `EntityInstance` block that read
-  `item.Data.SoundBank` (grep 0). Follow-up `wwise-catalog-fields` still names both; its live
-  set is `SoundBank` (key 21), `AudioStats` (key 22) and `Faction.OverworldMusic`,
-  `CombatMusic`, `BossMusic` (`Corporations.cs:52-59`, keys 13 to 15).
+  `item.Data.SoundBank` (grep 0). Follow-up `wwise-catalog-fields` retired the rest: `SoundBank`
+  (key 21), `AudioStats` (key 22, with `AudioStat`) and `Faction.OverworldMusic`, `CombatMusic`,
+  `BossMusic` (keys 13 to 15) are deleted, their keys left as never-reuse comments. The shipped
+  `GameData/Aetheria.cc` still carries the old values (29 equippables with a `SoundBank`, 2 factions
+  with music); the reader skips unknown keys and the next catalog write drops them.
 - `WwiseMetadata.cs` (91 lines) and `WwiseSoundBinding.cs` (21 lines) are used only by that
   surface; both have `.meta` files. A repo-wide grep outside `docs` finds the Wwise symbols in
   exactly these files: `ChargedWeapon.cs`, `InstantWeapon.cs`, `Reactor.cs`, `Thruster.cs`,