diff --git a/media/libeffects/visualizer/EffectVisualizer.cpp b/media/libeffects/visualizer/EffectVisualizer.cpp
index 03a6bbb..5505f14 100644
--- a/media/libeffects/visualizer/EffectVisualizer.cpp
+++ b/media/libeffects/visualizer/EffectVisualizer.cpp
@@ -65,8 +65,8 @@
 {
     pContext->mCaptureIdx = 0;
     pContext->mCurrentBuf = 0;
-    memset(pContext->mCaptureBuf[0], 0, VISUALIZER_CAPTURE_SIZE_MAX);
-    memset(pContext->mCaptureBuf[1], 0, VISUALIZER_CAPTURE_SIZE_MAX);
+    memset(pContext->mCaptureBuf[0], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
+    memset(pContext->mCaptureBuf[1], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
 }
 
 //----------------------------------------------------------------------------
diff --git a/media/libmedia/AudioEffect.cpp b/media/libmedia/AudioEffect.cpp
index 0f3e245..88b8c86 100644
--- a/media/libmedia/AudioEffect.cpp
+++ b/media/libmedia/AudioEffect.cpp
@@ -228,24 +228,32 @@
                               void *replyData)
 {
     if (mStatus != NO_ERROR && mStatus != ALREADY_EXISTS) {
+        LOGV("command() bad status %d", mStatus);
         return INVALID_OPERATION;
     }
 
+    if ((cmdCode == EFFECT_CMD_ENABLE || cmdCode == EFFECT_CMD_DISABLE) &&
+            (replySize == NULL || *replySize != sizeof(status_t) || replyData == NULL)) {
+        return BAD_VALUE;
+    }
+
     status_t status = mIEffect->command(cmdCode, cmdSize, cmdData, replySize, replyData);
     if (status != NO_ERROR) {
         return status;
     }
-    status = *(status_t *)replyData;
-    if (status != NO_ERROR) {
-        return status;
+
+    if (cmdCode == EFFECT_CMD_ENABLE || cmdCode == EFFECT_CMD_DISABLE) {
+        status = *(status_t *)replyData;
+        if (status != NO_ERROR) {
+            return status;
+        }
+        if (cmdCode == EFFECT_CMD_ENABLE) {
+            android_atomic_or(1, &mEnabled);
+        } else {
+            android_atomic_and(~1, &mEnabled);
+        }
     }
 
-    if (cmdCode == EFFECT_CMD_ENABLE) {
-        android_atomic_or(1, &mEnabled);
-    }
-    if (cmdCode == EFFECT_CMD_DISABLE) {
-        android_atomic_and(~1, &mEnabled);
-    }
     return status;
 }
 
diff --git a/media/libmedia/Visualizer.cpp b/media/libmedia/Visualizer.cpp
index 39552b6..68f2e9b 100644
--- a/media/libmedia/Visualizer.cpp
+++ b/media/libmedia/Visualizer.cpp
@@ -169,11 +169,13 @@
     status_t status = NO_ERROR;
     if (mEnabled) {
         uint32_t replySize = mCaptureSize;
-        status_t status = command(VISU_CMD_CAPTURE, 0, NULL, &replySize, waveform);
+        status = command(VISU_CMD_CAPTURE, 0, NULL, &replySize, waveform);
+        LOGV("getWaveForm() command returned %d", status);
         if (replySize == 0) {
             status = NOT_ENOUGH_DATA;
         }
     } else {
+        LOGV("getWaveForm() disabled");
         memset(waveform, 0x80, mCaptureSize);
     }
     return status;
@@ -191,7 +193,7 @@
     status_t status = NO_ERROR;
     if (mEnabled) {
         uint8_t buf[mCaptureSize];
-        status_t status = getWaveForm(buf);
+        status = getWaveForm(buf);
         if (status == NO_ERROR) {
             status = doFft(fft, buf);
         }