diff --git a/include/media/AudioEffect.h b/include/media/AudioEffect.h
index c967efb..cda2be0 100644
--- a/include/media/AudioEffect.h
+++ b/include/media/AudioEffect.h
@@ -403,7 +403,7 @@
      static status_t guidToString(const effect_uuid_t *guid, char *str, size_t maxLen);
 
 protected:
-     volatile int32_t        mEnabled;           // enable state
+     bool                    mEnabled;           // enable state
      int32_t                 mSessionId;         // audio session ID
      int32_t                 mPriority;          // priority for effect control
      status_t                mStatus;            // effect status
@@ -412,6 +412,7 @@
      void*                   mUserData;          // client context for callback function
      effect_descriptor_t     mDescriptor;        // effect descriptor
      int32_t                 mId;                // system wide unique effect engine instance ID
+     Mutex                   mLock;               // Mutex for mEnabled access
 
 private:
 
diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index 38e3d44..5f7cd90 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -356,7 +356,7 @@
     sp<IAudioRecord>        mAudioRecord;
     sp<IMemory>             mCblkMemory;
     sp<ClientRecordThread>  mClientRecordThread;
-    Mutex                   mRecordThreadLock;
+    Mutex                   mLock;
 
     uint32_t                mFrameCount;
 
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index 4475d4a..813a905 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -480,6 +480,7 @@
     uint32_t                mFlags;
     int                     mSessionId;
     int                     mAuxEffectId;
+    Mutex                   mLock;
 };