diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index ba848d7..58e3cbe 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -1196,6 +1196,8 @@
 
     { // scope for mLock
         Mutex::Autolock _l(mLock);
+        mNBLogWriter->logf("createTrack_l isFast=%d caller=%d",
+                (*flags & IAudioFlinger::TRACK_FAST) != 0, IPCThreadState::self()->getCallingPid());
 
         // all tracks in same audio session must share the same routing strategy otherwise
         // conflicts will happen when tracks are moved from one output to another by audio policy
@@ -1249,7 +1251,6 @@
     if (status) {
         *status = lStatus;
     }
-    mNBLogWriter->logf("createTrack_l");
     return track;
 }
 
@@ -1317,7 +1318,8 @@
 // addTrack_l() must be called with ThreadBase::mLock held
 status_t AudioFlinger::PlaybackThread::addTrack_l(const sp<Track>& track)
 {
-    mNBLogWriter->logf("addTrack_l mName=%d", track->mName);
+    mNBLogWriter->logf("addTrack_l mName=%d mFastIndex=%d caller=%d", track->mName,
+            track->mFastIndex, IPCThreadState::self()->getCallingPid());
     status_t status = ALREADY_EXISTS;
 
     // set retry count for buffer fill
@@ -1351,7 +1353,9 @@
 // destroyTrack_l() must be called with ThreadBase::mLock held
 void AudioFlinger::PlaybackThread::destroyTrack_l(const sp<Track>& track)
 {
-    mNBLogWriter->logf("destroyTrack_l mName=%d", track->mName);
+    mNBLogWriter->logTimestamp();
+    mNBLogWriter->logf("destroyTrack_l mName=%d mFastIndex=%d mClientPid=%d", track->mName,
+            track->mFastIndex, track->mClient != 0 ? track->mClient->pid() : -1);
     track->mState = TrackBase::TERMINATED;
     // active tracks are removed by threadLoop()
     if (mActiveTracks.indexOf(track) < 0) {
@@ -1361,7 +1365,9 @@
 
 void AudioFlinger::PlaybackThread::removeTrack_l(const sp<Track>& track)
 {
-    mNBLogWriter->logf("removeTrack_l mName=%d", track->mName);
+    mNBLogWriter->logTimestamp();
+    mNBLogWriter->logf("removeTrack_l mName=%d mFastIndex=%d clientPid=%d", track->mName,
+            track->mFastIndex, track->mClient != 0 ? track->mClient->pid() : -1);
     track->triggerEvents(AudioSystem::SYNC_EVENT_PRESENTATION_COMPLETE);
     mTracks.remove(track);
     deleteTrackName_l(track->name());
@@ -2149,6 +2155,7 @@
         FastTrack *fastTrack = &state->mFastTracks[0];
         // wrap the source side of the MonoPipe to make it an AudioBufferProvider
         fastTrack->mBufferProvider = new SourceAudioBufferProvider(new MonoPipeReader(monoPipe));
+        mNBLogWriter->logf("fastTrack0 bp=%p", fastTrack->mBufferProvider);
         fastTrack->mVolumeProvider = NULL;
         fastTrack->mGeneration++;
         state->mFastTracksGen++;
@@ -2553,6 +2560,7 @@
                 // was it previously inactive?
                 if (!(state->mTrackMask & (1 << j))) {
                     ExtendedAudioBufferProvider *eabp = track;
+                    mNBLogWriter->logf("fastTrack j=%d bp=%p", j, eabp);
                     VolumeProvider *vp = track;
                     fastTrack->mBufferProvider = eabp;
                     fastTrack->mVolumeProvider = vp;
@@ -2839,11 +2847,19 @@
             block = FastMixerStateQueue::BLOCK_UNTIL_ACKED;
             pauseAudioWatchdog = true;
         }
-        sq->end();
     }
     if (sq != NULL) {
+        unsigned trackMask = state->mTrackMask;
         sq->end(didModify);
+        if (didModify) {
+            mNBLogWriter->logTimestamp();
+            mNBLogWriter->logf("push trackMask=%#x block=%d", trackMask, block);
+        }
         sq->push(block);
+        if (didModify) {
+            mNBLogWriter->logTimestamp();
+            mNBLogWriter->log("pushed");
+        }
     }
 #ifdef AUDIO_WATCHDOG
     if (pauseAudioWatchdog && mAudioWatchdog != 0) {
@@ -2870,7 +2886,9 @@
     if (CC_UNLIKELY(count)) {
         for (size_t i=0 ; i<count ; i++) {
             const sp<Track>& track = tracksToRemove->itemAt(i);
-            mNBLogWriter->logf("prepareTracks_l remove name=%u", track->name());
+            mNBLogWriter->logTimestamp();
+            mNBLogWriter->logf("prepareTracks_l remove name=%u mFastIndex=%d", track->name(),
+                    track->mFastIndex);
             mActiveTracks.remove(track);
             if (track->mainBuffer() != mMixBuffer) {
                 chain = getEffectChain_l(track->sessionId());