diff --git a/src/audiocapturedevice.h b/src/audiocapturedevice.h
index 448a4c0b..6ea2456a 100644
--- a/src/audiocapturedevice.h
+++ b/src/audiocapturedevice.h
@@ -1,7 +1,7 @@
 #pragma once
 
-// This class has been modified from QT audio input example
 
+// This class has been modified from QT audio input example
 
 #include <QAudioInput>
 
diff --git a/src/audiocapturefilter.cpp b/src/audiocapturefilter.cpp
index 4dcf7985..7d89737d 100644
--- a/src/audiocapturefilter.cpp
+++ b/src/audiocapturefilter.cpp
@@ -1,7 +1,6 @@
 #include "audiocapturefilter.h"
 
 #include <QDebug>
-
 #include <QTime>
 
 
@@ -12,9 +11,9 @@ const int AUDIO_BUFFER_SIZE = 65536;
 AudioCaptureFilter::AudioCaptureFilter(StatisticsInterface *stats) :
   Filter("Audio capture", stats, false, true),
   deviceInfo_(QAudioDeviceInfo::defaultInputDevice()),
-  device_(0),
-  audioInput_(0),
-  input_(0),
+  device_(NULL),
+  audioInput_(NULL),
+  input_(NULL),
   buffer_(AUDIO_BUFFER_SIZE, 0)
 {}
 
@@ -39,7 +38,6 @@ void AudioCaptureFilter::initializeAudio(QAudioFormat format)
   if (device_)
     delete device_;
   device_  = new AudioCaptureDevice(format_, this);
-  // connect(device_, SIGNAL(update()), SLOT(refreshDisplay()));
 
   createAudioInput();
   qDebug() << "Audio initializing completed";
@@ -49,7 +47,6 @@ void AudioCaptureFilter::createAudioInput()
 {
   qDebug() << "Creating audio input";
   audioInput_ = new QAudioInput(deviceInfo_, format_, this);
-  //volumeSlider->setValue(audioInput->volume() * 100);
 
   device_->start();
 
@@ -78,7 +75,7 @@ void AudioCaptureFilter::readMore()
 
     Data* newSample = new Data;
 
-    // set time
+    // create audio data packet to be sent to filter graph
     timeval present_time;
     present_time.tv_sec = QDateTime::currentMSecsSinceEpoch()/1000;
     present_time.tv_usec = (QDateTime::currentMSecsSinceEpoch()%1000) * 1000;
@@ -127,23 +124,6 @@ void AudioCaptureFilter::stop()
   qDebug() << "Audio input suspended.";
 }
 
-void AudioCaptureFilter::toggleSuspend()
-{
-  // toggle suspend/resume
-  if (audioInput_->state() == QAudio::SuspendedState) {
-    audioInput_->resume();
-    //suspendResumeButton_->setText(tr(SUSPEND_LABEL));
-  } else if (audioInput_->state() == QAudio::ActiveState) {
-    audioInput_->suspend();
-    //m_suspendResumeButton->setText(tr(RESUME_LABEL));
-  } else if (audioInput_->state() == QAudio::StoppedState) {
-    audioInput_->resume();
-    //m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
-  } else if (audioInput_->state() == QAudio::IdleState) {
-    // no-op
-  }
-}
-
 // changing of audio device mid stream.
 void AudioCaptureFilter::deviceChanged(int index)
 {
@@ -152,7 +132,6 @@ void AudioCaptureFilter::deviceChanged(int index)
   audioInput_->disconnect(this);
   delete audioInput_;
 
-  //deviceInfo_ = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();
   initializeAudio(format_);
 }
 
@@ -165,6 +144,4 @@ void AudioCaptureFilter::volumeChanged(int value)
 }
 
 void AudioCaptureFilter::process()
-{
-
-}
+{}
diff --git a/src/audiocapturefilter.h b/src/audiocapturefilter.h
index fa651855..caeab480 100644
--- a/src/audiocapturefilter.h
+++ b/src/audiocapturefilter.h
@@ -5,6 +5,7 @@
 
 #include <QByteArray>
 
+//TODO: this class would not have to be a filter, just needs to send data to one
 
 class AudioCaptureFilter : public Filter
 {
@@ -30,10 +31,7 @@ private slots:
 
 private:
 
-  void toggleMode();
-  void toggleSuspend();
   void deviceChanged(int index);
-
   void createAudioInput();
 
   QAudioDeviceInfo deviceInfo_;
diff --git a/src/audiooutput.cpp b/src/audiooutput.cpp
index 10f517f7..279c1948 100644
--- a/src/audiooutput.cpp
+++ b/src/audiooutput.cpp
@@ -24,9 +24,6 @@ AudioOutput::~AudioOutput()
 
 void AudioOutput::initializeAudio(QAudioFormat format)
 {
-  // connect(m_pushTimer, SIGNAL(timeout()), SLOT(pushTimerExpired()));
-
-
   QAudioDeviceInfo info(device_);
   if (!info.isFormatSupported(format)) {
     qWarning() << "Default format not supported - trying to use nearest";
@@ -57,13 +54,6 @@ void AudioOutput::createAudioOutput()
   source_->start();
   // pull mode
   output_ = audioOutput_->start();
-
-
-  // push mode
-  // audioOutput_->start(source_);
-
-
- // m_volumeSlider->setValue(int(m_audioOutput->volume()*100.0f));
 }
 
 void AudioOutput::deviceChanged(int index)
@@ -98,18 +88,19 @@ void AudioOutput::receiveInput()
   }
 }
 
-void AudioOutput::toggleSuspendResume()
+void AudioOutput::start()
 {
-  if (audioOutput_->state() == QAudio::SuspendedState) {
+  if(audioOutput_->state() == QAudio::SuspendedState
+     || audioOutput_->state() == QAudio::StoppedState)
+  {
     audioOutput_->resume();
-//    m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
-  } else if (audioOutput_->state() == QAudio::ActiveState) {
+  }
+}
+
+void AudioOutput::stop()
+{
+  if(audioOutput_->state() == QAudio::ActiveState)
+  {
     audioOutput_->suspend();
-//    m_suspendResumeButton->setText(tr(RESUME_LABEL));
-  } else if (audioOutput_->state() == QAudio::StoppedState) {
-    audioOutput_->resume();
-//    m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
-  } else if (audioOutput_->state() == QAudio::IdleState) {
-    // no-op
   }
 }
diff --git a/src/audiooutput.h b/src/audiooutput.h
index ead721fa..1bbe5774 100644
--- a/src/audiooutput.h
+++ b/src/audiooutput.h
@@ -20,6 +20,9 @@ class AudioOutput : public QObject
     return source_;
   }
 
+  void start();
+  void stop();
+
 private:
 
   void createAudioOutput();
@@ -38,7 +41,6 @@ class AudioOutput : public QObject
 
 private slots:
   void receiveInput();
-  void toggleSuspendResume();
   void deviceChanged(int index);
   void volumeChanged(int);
 };
diff --git a/src/audiooutputdevice.h b/src/audiooutputdevice.h
index 8253ab05..1ebe4b6f 100644
--- a/src/audiooutputdevice.h
+++ b/src/audiooutputdevice.h
@@ -16,10 +16,12 @@ class AudioOutputDevice : public QIODevice
   void start();
   void stop();
 
+  // read data from buffer
   qint64 readData(char *data, qint64 maxlen);
-  qint64 writeData(const char *data, qint64 len);
+  qint64 writeData(const char *data, qint64 len); // unused
   qint64 bytesAvailable() const;
 
+  // Receives input from filter graph and tells output that there is input available
   void takeInput(std::unique_ptr<Data> input);
 
 signals:
diff --git a/src/cameraframegrabber.cpp b/src/cameraframegrabber.cpp
index a65060c5..2599616b 100644
--- a/src/cameraframegrabber.cpp
+++ b/src/cameraframegrabber.cpp
@@ -4,9 +4,7 @@
 
 CameraFrameGrabber::CameraFrameGrabber(QObject *parent) :
   QAbstractVideoSurface(parent)
-{
-
-}
+{}
 
 bool CameraFrameGrabber::present(const QVideoFrame &frame)
 {