diff --git a/include/media/Visualizer.h b/include/media/Visualizer.h
index 60fa15b..fdec5ee 100644
--- a/include/media/Visualizer.h
+++ b/include/media/Visualizer.h
@@ -108,6 +108,12 @@
     // returns the sampling rate of the audio being captured
     uint32_t getSamplingRate() { return mSampleRate; }
 
+    // set the way volume affects the captured data
+    // mode must one of VISUALIZER_SCALING_MODE_NORMALIZED,
+    //  VISUALIZER_SCALING_MODE_AS_PLAYED
+    status_t setScalingMode(uint32_t mode);
+    uint32_t getScalingMode() { return mScalingMode; }
+
     // return a capture in PCM 8 bit unsigned format. The size of the capture is equal to
     // getCaptureSize()
     status_t getWaveForm(uint8_t *waveform);
@@ -117,6 +123,10 @@
     // are returned
     status_t getFft(uint8_t *fft);
 
+protected:
+    // from IEffectClient
+    virtual void controlStatusChanged(bool controlGranted);
+
 private:
 
     static const uint32_t CAPTURE_RATE_MAX = 20000;
@@ -147,6 +157,7 @@
     uint32_t mCaptureRate;
     uint32_t mCaptureSize;
     uint32_t mSampleRate;
+    uint32_t mScalingMode;
     capture_cbk_t mCaptureCallBack;
     void *mCaptureCbkUser;
     sp<CaptureThread> mCaptureThread;