diff --git a/Source/BaseVoice.cpp b/Source/BaseVoice.cpp
index ada2bdc..67fa17b 100644
--- a/Source/BaseVoice.cpp
+++ b/Source/BaseVoice.cpp
@@ -89,6 +89,10 @@ void BaseVoice::stopNote (float, bool allowTailOff)
     {
         if (settingRefs->volumeSequence.hasRelease)
         {
+            if (settingRefs->volumeSequence.isInRelease(currentVolumeSequenceFrame)) {
+                // Already in release(Custom Env.)
+                return ;
+            }
             currentVolumeSequenceFrame = settingRefs->volumeSequence.releaseSequenceStartIndex;
             currentEnvelopeLevel = (float) (settingRefs->volumeSequence.valueAt (0)) / 15.0f;
         }
@@ -100,6 +104,11 @@ void BaseVoice::stopNote (float, bool allowTailOff)
 
         return;
     }
+    
+    if (envelopePhase == kEnvelopePhaseR) {
+        // Already in release(ADSR)
+        return;
+    }
 
     envelopePhase = kEnvelopePhaseR;
 }
diff --git a/Source/FrameSequence.h b/Source/FrameSequence.h
index 953e8a3..007c0be 100644
--- a/Source/FrameSequence.h
+++ b/Source/FrameSequence.h
@@ -68,4 +68,8 @@ struct FrameSequence
 
         // No reach here
     }
+    
+    bool isInRelease(int index) {
+        return index >= releaseSequenceStartIndex;
+    }
 };