diff --git a/Packages/com.mimylab.fukuroudon/CHANGELOG.md b/Packages/com.mimylab.fukuroudon/CHANGELOG.md
index 4fd1866..10469ab 100644
--- a/Packages/com.mimylab.fukuroudon/CHANGELOG.md
+++ b/Packages/com.mimylab.fukuroudon/CHANGELOG.md
@@ -6,6 +6,12 @@
 
 利用手順は[こちら](https://github.com/mimyquality/FukuroUdon/wiki)からご確認ください。
 
+## [1.18.1] - 2024/4/17
+
+- **Fixed**
+  - AmbientSound Assistant
+    - Flexible TransformのActive Rangeが0の時、オブジェクトが常に非アクティブになってしまうのを修正しました。
+
 ## [1.18.0] - 2024/4/16
 
 - **Added**
@@ -423,6 +429,7 @@
     - 0.2.7バージョンで、later-joiner視点でjoin直後が非アクティブだと同期しなかったのを修正しました。
     - 他人がピックアップした際にオブジェクトが一瞬跳ねる現象を低減しました。
 
+[1.18.1]: https://github.com/mimyquality/FukuroUdon/releases/tag/1.18.1
 [1.18.0]: https://github.com/mimyquality/FukuroUdon/releases/tag/1.18.0
 [1.17.0]: https://github.com/mimyquality/FukuroUdon/releases/tag/1.17.0
 [1.16.4]: https://github.com/mimyquality/FukuroUdon/releases/tag/1.16.4
diff --git a/Packages/com.mimylab.fukuroudon/Runtime/ActiveRelay/Scripts/ActiveRelayToGameObject.asset b/Packages/com.mimylab.fukuroudon/Runtime/ActiveRelay/Scripts/ActiveRelayToGameObject.asset
index b79185f..31091bc 100644
--- a/Packages/com.mimylab.fukuroudon/Runtime/ActiveRelay/Scripts/ActiveRelayToGameObject.asset
+++ b/Packages/com.mimylab.fukuroudon/Runtime/ActiveRelay/Scripts/ActiveRelayToGameObject.asset
@@ -57,11 +57,17 @@ MonoBehaviour:
       Entry: 1
       Data: _eventType
     - Name: <UserType>k__BackingField
-      Entry: 6
+      Entry: 7
+      Data: 3|System.RuntimeType, mscorlib
+    - Name: 
+      Entry: 1
+      Data: MimyLab.ActiveRelayEventType, FukuroUdon
+    - Name: 
+      Entry: 8
       Data: 
     - Name: <SystemType>k__BackingField
       Entry: 7
-      Data: 3|System.RuntimeType, mscorlib
+      Data: 4|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
       Data: System.Int32, mscorlib
@@ -82,13 +88,13 @@ MonoBehaviour:
       Data: true
     - Name: _fieldAttributes
       Entry: 7
-      Data: 4|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+      Data: 5|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
       Data: 1
     - Name: 
       Entry: 7
-      Data: 5|UnityEngine.SerializeField, UnityEngine.CoreModule
+      Data: 6|UnityEngine.SerializeField, UnityEngine.CoreModule
     - Name: 
       Entry: 8
       Data: 
@@ -112,13 +118,13 @@ MonoBehaviour:
       Data: _gameObjects
     - Name: $v
       Entry: 7
-      Data: 6|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+      Data: 7|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
       Data: _gameObjects
     - Name: <UserType>k__BackingField
       Entry: 7
-      Data: 7|System.RuntimeType, mscorlib
+      Data: 8|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
       Data: UnityEngine.GameObject[], UnityEngine.CoreModule
@@ -127,7 +133,7 @@ MonoBehaviour:
       Data: 
     - Name: <SystemType>k__BackingField
       Entry: 9
-      Data: 7
+      Data: 8
     - Name: <SyncMode>k__BackingField
       Entry: 7
       Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
@@ -142,13 +148,13 @@ MonoBehaviour:
       Data: true
     - Name: _fieldAttributes
       Entry: 7
-      Data: 8|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+      Data: 9|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
       Data: 1
     - Name: 
       Entry: 7
-      Data: 9|UnityEngine.SerializeField, UnityEngine.CoreModule
+      Data: 10|UnityEngine.SerializeField, UnityEngine.CoreModule
     - Name: 
       Entry: 8
       Data: 
@@ -172,13 +178,13 @@ MonoBehaviour:
       Data: _invert
     - Name: $v
       Entry: 7
-      Data: 10|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+      Data: 11|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
       Data: _invert
     - Name: <UserType>k__BackingField
       Entry: 7
-      Data: 11|System.RuntimeType, mscorlib
+      Data: 12|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
       Data: System.Boolean, mscorlib
@@ -187,7 +193,7 @@ MonoBehaviour:
       Data: 
     - Name: <SystemType>k__BackingField
       Entry: 9
-      Data: 11
+      Data: 12
     - Name: <SyncMode>k__BackingField
       Entry: 7
       Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
@@ -202,13 +208,13 @@ MonoBehaviour:
       Data: true
     - Name: _fieldAttributes
       Entry: 7
-      Data: 12|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+      Data: 13|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
       Data: 1
     - Name: 
       Entry: 7
-      Data: 13|UnityEngine.SerializeField, UnityEngine.CoreModule
+      Data: 14|UnityEngine.SerializeField, UnityEngine.CoreModule
     - Name: 
       Entry: 8
       Data: 
diff --git a/Packages/com.mimylab.fukuroudon/package.json b/Packages/com.mimylab.fukuroudon/package.json
index cf87be7..f1738e1 100644
--- a/Packages/com.mimylab.fukuroudon/package.json
+++ b/Packages/com.mimylab.fukuroudon/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.mimylab.fukuroudon",
   "displayName": "Fukuro Udon",
-  "version": "1.18.0",
+  "version": "1.18.1",
   "description": "MimyLab's U# utilitiy pack for VPM.",
   "unity": "2019.4",
   "author": {