diff --git a/effects/paneffect.cpp b/effects/paneffect.cpp
index a7f932da5..3a779939e 100644
--- a/effects/paneffect.cpp
+++ b/effects/paneffect.cpp
@@ -47,22 +47,24 @@ void PanEffect::save(QXmlStreamWriter *stream) {
 }
 
 void PanEffect::process_audio(quint8 *samples, int nb_bytes) {
-	for (int i=0;i<nb_bytes;i+=4) {
-        qint16 left_sample = (qint16) ((samples[i+1] << 8) | samples[i]);
-        qint16 right_sample = (qint16) ((samples[i+3] << 8) | samples[i+2]);
+    if (pan_val->value() != 0) {
+        for (int i=0;i<nb_bytes;i+=4) {
+            qint16 left_sample = (qint16) ((samples[i+1] << 8) | samples[i]);
+            qint16 right_sample = (qint16) ((samples[i+3] << 8) | samples[i+2]);
 
-		float val = pan_val->value()*0.01;
-		if (val < 0) {
-			// affect right channel
-            right_sample *= (1-std::abs(val));
-		} else {
-			// affect left channel
-			left_sample *= (1-val);
-		}
+            float val = pan_val->value()*0.01f;
+            if (val < 0) {
+                // affect right channel
+                right_sample *= (1-std::abs(val));
+            } else {
+                // affect left channel
+                left_sample *= (1-val);
+            }
 
-        samples[i+3] = (quint8) (right_sample >> 8);
-        samples[i+2] = (quint8) right_sample;
-        samples[i+1] = (quint8) (left_sample >> 8);
-        samples[i] = (quint8) left_sample;
-	}
+            samples[i+3] = (quint8) (right_sample >> 8);
+            samples[i+2] = (quint8) right_sample;
+            samples[i+1] = (quint8) (left_sample >> 8);
+            samples[i] = (quint8) left_sample;
+        }
+    }
 }
diff --git a/effects/volumeeffect.cpp b/effects/volumeeffect.cpp
index 5c64ebd8b..a3c59fb56 100644
--- a/effects/volumeeffect.cpp
+++ b/effects/volumeeffect.cpp
@@ -3,6 +3,7 @@
 #include <QGridLayout>
 #include <QSpinBox>
 #include <QLabel>
+#include <QDebug>
 
 #include "ui/collapsiblewidget.h"
 
@@ -31,7 +32,7 @@ Effect* VolumeEffect::copy(Clip* c) {
     return v;
 }
 
-void VolumeEffect::load(QXmlStreamReader *stream) {
+void VolumeEffect::load(QXmlStreamReader* stream) {
     while (!(stream->isEndElement() && stream->name() == "effect") && !stream->atEnd()) {
         stream->readNext();
         if (stream->isStartElement() && stream->name() == "volume") {
@@ -41,17 +42,17 @@ void VolumeEffect::load(QXmlStreamReader *stream) {
     }
 }
 
-void VolumeEffect::save(QXmlStreamWriter *stream) {
+void VolumeEffect::save(QXmlStreamWriter* stream) {
     stream->writeTextElement("volume", QString::number(volume_val->value()));
 }
 
-void VolumeEffect::process_audio(quint8 *samples, int nb_bytes) {
-	for (int i=0;i<nb_bytes;i+=2) {
-        qint16 full_sample = (qint16) ((samples[i+1] << 8) | samples[i]);
-
-		full_sample *= volume_val->value()*0.01;
-
-        samples[i+1] = (quint8) (full_sample >> 8);
-        samples[i] = (quint8) full_sample;
-	}
+void VolumeEffect::process_audio(quint8* samples, int nb_bytes) {
+    if (volume_val->value() != 0) {
+        for (int i=0;i<nb_bytes;i+=2) {
+            qint16 samp = (qint16) ((samples[i+1] << 8) | samples[i]);
+            samp *= (volume_val->value()*0.01f);
+            samples[i+1] = (quint8) (samp >> 8);
+            samples[i] = (quint8) samp;
+        }
+    }
 }
diff --git a/playback/cacher.cpp b/playback/cacher.cpp
index fe8d4d91a..312dff63f 100644
--- a/playback/cacher.cpp
+++ b/playback/cacher.cpp
@@ -32,6 +32,13 @@ void cache_audio_worker(Clip* c) {
                 // but there still may be samples in swresample
                 swr_convert_frame(c->swr_ctx, frame, NULL);
             }
+
+            // perform all audio effects
+            int nb_bytes = av_samples_get_buffer_size(NULL, frame->channels, frame->nb_samples, static_cast<AVSampleFormat>(frame->format), 1);
+            for (int j=0;j<c->effects.size();j++) {
+                Effect* e = c->effects.at(j);
+                if (e->is_enabled()) e->process_audio(frame->data[0], nb_bytes);
+            }
         }
 
         if (frame->nb_samples == 0) {
@@ -39,11 +46,6 @@ void cache_audio_worker(Clip* c) {
         } else {
             int nb_bytes = av_samples_get_buffer_size(NULL, frame->channels, frame->nb_samples, static_cast<AVSampleFormat>(frame->format), 1);
 
-            // perform all audio effects
-            for (int j=0;j<c->effects.size();j++) {
-                c->effects.at(j)->process_audio(frame->data[0], nb_bytes);
-            }
-
             if (c->audio_buffer_write == 0) c->audio_buffer_write = (((int)(audio_ibuffer_read/2))*2) + 1024;
             int half_buffer = (audio_ibuffer_size/2);
             while (c->frame_sample_index < nb_bytes) {
diff --git a/project/effect.cpp b/project/effect.cpp
index 8c6caa2f5..13b07b191 100644
--- a/project/effect.cpp
+++ b/project/effect.cpp
@@ -6,6 +6,8 @@
 #include "ui/collapsiblewidget.h"
 #include "effects/effects.h"
 
+#include <QCheckBox>
+
 Effect::Effect(Clip* c) : parent_clip(c)
 {
 	name = "<unnamed effect>";
@@ -28,6 +30,10 @@ void Effect::field_changed() {
 	panel_viewer->viewer_widget->update();
 }
 
+bool Effect::is_enabled() {
+    return container->enabled_check->isChecked();
+}
+
 Effect* Effect::copy(Clip*) {return NULL;}
 void Effect::load(QXmlStreamReader*) {}
 void Effect::save(QXmlStreamWriter*) {}
diff --git a/project/effect.h b/project/effect.h
index 2e731bdb1..f47495383 100644
--- a/project/effect.h
+++ b/project/effect.h
@@ -24,6 +24,8 @@ public:
 	QWidget* ui;
     Clip* parent_clip;
 
+    bool is_enabled();
+
     virtual Effect* copy(Clip* c);
     virtual void load(QXmlStreamReader* stream);
     virtual void save(QXmlStreamWriter* stream);
diff --git a/ui/collapsiblewidget.h b/ui/collapsiblewidget.h
index b771c8387..58aa4a02d 100644
--- a/ui/collapsiblewidget.h
+++ b/ui/collapsiblewidget.h
@@ -16,9 +16,10 @@ public:
 	CollapsibleWidget(QWidget* parent = 0);
 	void setContents(QWidget* c);
 	void setText(const QString &);
+
+    QCheckBox* enabled_check;
 private:
 	QLabel* header;
-	QCheckBox* enabled_check;
 	QHBoxLayout* title_bar;
 	QVBoxLayout* layout;
 	QPushButton* collapse_button;