diff --git a/effects/effects.h b/effects/effects.h
index 247cf5bb6..b2d5396ed 100644
--- a/effects/effects.h
+++ b/effects/effects.h
@@ -6,6 +6,7 @@
 #include <QXmlStreamWriter>
 class QSpinBox;
 class QCheckBox;
+class LabelSlider;
 
 enum VideoEffects {
 	VIDEO_TRANSFORM_EFFECT,
@@ -31,15 +32,15 @@ public:
 	void process_gl(int* anchor_x, int* anchor_y);
     Effect* copy(Clip* c);
 
-	QSpinBox* position_x;
-	QSpinBox* position_y;
-	QSpinBox* scale_x;
-	QSpinBox* scale_y;
+    LabelSlider* position_x;
+    LabelSlider* position_y;
+    LabelSlider* scale_x;
+    LabelSlider* scale_y;
 	QCheckBox* uniform_scale_box;
-	QSpinBox* rotation;
-	QSpinBox* anchor_x_box;
-	QSpinBox* anchor_y_box;
-	QSpinBox* opacity;
+    LabelSlider* rotation;
+    LabelSlider* anchor_x_box;
+    LabelSlider* anchor_y_box;
+    LabelSlider* opacity;
 public slots:
 	void toggle_uniform_scale(bool enabled);
 private:
@@ -56,7 +57,7 @@ public:
     void load(QXmlStreamReader* stream);
     void save(QXmlStreamWriter* stream);
 
-	QSpinBox* volume_val;
+    LabelSlider* volume_val;
 };
 
 class PanEffect : public Effect {
@@ -67,7 +68,7 @@ public:
     void load(QXmlStreamReader* stream);
     void save(QXmlStreamWriter* stream);
 
-	QSpinBox* pan_val;
+    LabelSlider* pan_val;
 };
 
 #endif // EFFECTS_H
diff --git a/effects/paneffect.cpp b/effects/paneffect.cpp
index 3a779939e..e11bf9de0 100644
--- a/effects/paneffect.cpp
+++ b/effects/paneffect.cpp
@@ -1,10 +1,10 @@
 #include "effects/effects.h"
 
 #include <QGridLayout>
-#include <QSpinBox>
 #include <QLabel>
 #include <cmath>
 
+#include "ui/labelslider.h"
 #include "ui/collapsiblewidget.h"
 
 PanEffect::PanEffect(Clip* c) : Effect(c) {
@@ -13,9 +13,9 @@ PanEffect::PanEffect(Clip* c) : Effect(c) {
     QGridLayout* ui_layout = new QGridLayout();
 
 	ui_layout->addWidget(new QLabel("Pan:"), 0, 0);
-	pan_val = new QSpinBox();
-	pan_val->setMinimum(-100);
-	pan_val->setMaximum(100);
+    pan_val = new LabelSlider();
+    pan_val->set_minimum_value(-100);
+    pan_val->set_maximum_value(100);
 	ui_layout->addWidget(pan_val, 0, 1);
 
 	ui->setLayout(ui_layout);
@@ -23,12 +23,12 @@ PanEffect::PanEffect(Clip* c) : Effect(c) {
 	container->setContents(ui);
 
 	// set defaults
-	pan_val->setValue(0);
+    pan_val->set_value(0);
 }
 
 Effect* PanEffect::copy(Clip* c) {
     PanEffect* p = new PanEffect(c);
-    p->pan_val->setValue(pan_val->value());
+    p->pan_val->set_value(pan_val->value());
     return p;
 }
 
@@ -37,7 +37,7 @@ void PanEffect::load(QXmlStreamReader *stream) {
         stream->readNext();
         if (stream->isStartElement() && stream->name() == "pan") {
             stream->readNext();
-            pan_val->setValue(stream->text().toInt());
+            pan_val->set_value(stream->text().toInt());
         }
     }
 }
diff --git a/effects/transformeffect.cpp b/effects/transformeffect.cpp
index d9a724e24..8500fc64a 100644
--- a/effects/transformeffect.cpp
+++ b/effects/transformeffect.cpp
@@ -12,6 +12,7 @@
 #include "project/clip.h"
 #include "project/sequence.h"
 #include "io/media.h"
+#include "ui/labelslider.h"
 
 TransformEffect::TransformEffect(Clip* c) : Effect(c) {
     setup_effect(EFFECT_TYPE_VIDEO, VIDEO_TRANSFORM_EFFECT);
@@ -19,23 +20,20 @@ TransformEffect::TransformEffect(Clip* c) : Effect(c) {
 	QGridLayout* ui_layout = new QGridLayout();
 
 	ui_layout->addWidget(new QLabel("Position:"), 0, 0);
-	position_x = new QSpinBox();
-	position_x->setMinimum(-QWIDGETSIZE_MAX);
-	position_x->setMaximum(QWIDGETSIZE_MAX);
-	ui_layout->addWidget(position_x, 0, 1);
-	position_y = new QSpinBox();
-	position_y->setMinimum(-QWIDGETSIZE_MAX);
-	position_y->setMaximum(QWIDGETSIZE_MAX);
+    position_x = new LabelSlider();
+    ui_layout->addWidget(position_x, 0, 1);
+
+    position_y = new LabelSlider();
 	ui_layout->addWidget(position_y, 0, 2);
 
 	ui_layout->addWidget(new QLabel("Scale:"), 1, 0);
-	scale_x = new QSpinBox();
-	scale_x->setMinimum(0);
-	scale_x->setMaximum(1200);
+    scale_x = new LabelSlider();
+    scale_x->set_minimum_value(0);
+    scale_x->set_maximum_value(1200);
 	ui_layout->addWidget(scale_x, 1, 1);
-	scale_y = new QSpinBox();
-	scale_y->setMinimum(0);
-	scale_y->setMaximum(1200);
+    scale_y = new LabelSlider();
+    scale_y->set_minimum_value(0);
+    scale_y->set_maximum_value(1200);
 	ui_layout->addWidget(scale_y, 1, 2);
 
 	uniform_scale_box = new QCheckBox();
@@ -43,25 +41,19 @@ TransformEffect::TransformEffect(Clip* c) : Effect(c) {
 	ui_layout->addWidget(uniform_scale_box, 2, 1);
 
 	ui_layout->addWidget(new QLabel("Rotation:"), 3, 0);
-	rotation = new QSpinBox();
-	rotation->setMinimum(-QWIDGETSIZE_MAX);
-	rotation->setMaximum(QWIDGETSIZE_MAX);
+    rotation = new LabelSlider();
 	ui_layout->addWidget(rotation, 3, 1);
 
 	ui_layout->addWidget(new QLabel("Anchor Point:"), 4, 0);
-	anchor_x_box = new QSpinBox();
-	anchor_x_box->setMinimum(-QWIDGETSIZE_MAX);
-	anchor_x_box->setMaximum(QWIDGETSIZE_MAX);
+    anchor_x_box = new LabelSlider();
 	ui_layout->addWidget(anchor_x_box, 4, 1);
-	anchor_y_box = new QSpinBox();
-	anchor_y_box->setMinimum(-QWIDGETSIZE_MAX);
-	anchor_y_box->setMaximum(QWIDGETSIZE_MAX);
+    anchor_y_box = new LabelSlider();
 	ui_layout->addWidget(anchor_y_box, 4, 2);
 
 	ui_layout->addWidget(new QLabel("Opacity:"), 5, 0);
-	opacity = new QSpinBox();
-	opacity->setMinimum(0);
-	opacity->setMaximum(100);
+    opacity = new LabelSlider();
+    opacity->set_minimum_value(0);
+    opacity->set_maximum_value(100);
 	ui_layout->addWidget(opacity, 5, 1);
 
 	ui->setLayout(ui_layout);
@@ -69,41 +61,41 @@ TransformEffect::TransformEffect(Clip* c) : Effect(c) {
 	container->setContents(ui);
 
 	// set defaults
-    position_x->setValue(c->sequence->width/2);
-    position_y->setValue(c->sequence->height/2);
-	scale_x->setValue(100);
-	scale_y->setValue(100);
+    position_x->set_default_value(c->sequence->width/2);
+    position_y->set_default_value(c->sequence->height/2);
+    scale_x->set_default_value(100);
+    scale_y->set_default_value(100);
 	scale_y->setEnabled(false);
 	uniform_scale_box->setChecked(true);
     default_anchor_x = c->media_stream->video_width/2;
     default_anchor_y = c->media_stream->video_height/2;
-    anchor_x_box->setValue(default_anchor_x);
-    anchor_y_box->setValue(default_anchor_y);
-	opacity->setValue(100);
+    anchor_x_box->set_default_value(default_anchor_x);
+    anchor_y_box->set_default_value(default_anchor_y);
+    opacity->set_default_value(100);
 
-	connect(position_x, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(position_y, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(rotation, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(scale_x, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(scale_y, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(anchor_x_box, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(anchor_y_box, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
-	connect(opacity, SIGNAL(valueChanged(int)), this, SLOT(field_changed()));
+    connect(position_x, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(position_y, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(rotation, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(scale_x, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(scale_y, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(anchor_x_box, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(anchor_y_box, SIGNAL(valueChanged()), this, SLOT(field_changed()));
+    connect(opacity, SIGNAL(valueChanged()), this, SLOT(field_changed()));
 	connect(uniform_scale_box, SIGNAL(toggled(bool)), this, SLOT(toggle_uniform_scale(bool)));
 	connect(uniform_scale_box, SIGNAL(toggled(bool)), this, SLOT(field_changed()));
 }
 
 Effect* TransformEffect::copy(Clip* c) {
     TransformEffect* t = new TransformEffect(c);
-    t->position_x->setValue(position_x->value());
-    t->position_y->setValue(position_y->value());
-    t->scale_x->setValue(scale_x->value());
-    t->scale_y->setValue(scale_y->value());
+    t->position_x->set_value(position_x->value());
+    t->position_y->set_value(position_y->value());
+    t->scale_x->set_value(scale_x->value());
+    t->scale_y->set_value(scale_y->value());
     t->uniform_scale_box->setChecked(uniform_scale_box->isChecked());
-    t->rotation->setValue(rotation->value());
-    t->anchor_x_box->setValue(anchor_x_box->value());
-    t->anchor_y_box->setValue(anchor_y_box->value());
-    t->opacity->setValue(opacity->value());
+    t->rotation->set_value(rotation->value());
+    t->anchor_x_box->set_value(anchor_x_box->value());
+    t->anchor_y_box->set_value(anchor_y_box->value());
+    t->opacity->set_value(opacity->value());
     return t;
 }
 
diff --git a/effects/volumeeffect.cpp b/effects/volumeeffect.cpp
index a3c59fb56..977c18333 100644
--- a/effects/volumeeffect.cpp
+++ b/effects/volumeeffect.cpp
@@ -1,10 +1,10 @@
 #include "effects/effects.h"
 
 #include <QGridLayout>
-#include <QSpinBox>
 #include <QLabel>
 #include <QDebug>
 
+#include "ui/labelslider.h"
 #include "ui/collapsiblewidget.h"
 
 VolumeEffect::VolumeEffect(Clip* c) : Effect(c) {
@@ -13,9 +13,9 @@ VolumeEffect::VolumeEffect(Clip* c) : Effect(c) {
 	QGridLayout* ui_layout = new QGridLayout();
 
 	ui_layout->addWidget(new QLabel("Volume:"), 0, 0);
-	volume_val = new QSpinBox();
-	volume_val->setMinimum(0);
-    volume_val->setMaximum(400);
+    volume_val = new LabelSlider();
+    volume_val->set_minimum_value(0);
+    volume_val->set_maximum_value(400);
 	ui_layout->addWidget(volume_val, 0, 1);
 
 	ui->setLayout(ui_layout);
@@ -23,12 +23,12 @@ VolumeEffect::VolumeEffect(Clip* c) : Effect(c) {
 	container->setContents(ui);
 
 	// set defaults
-	volume_val->setValue(100);
+    volume_val->set_value(100);
 }
 
 Effect* VolumeEffect::copy(Clip* c) {
     VolumeEffect* v = new VolumeEffect(c);
-    v->volume_val->setValue(volume_val->value());
+    v->volume_val->set_value(volume_val->value());
     return v;
 }
 
@@ -37,7 +37,7 @@ void VolumeEffect::load(QXmlStreamReader* stream) {
         stream->readNext();
         if (stream->isStartElement() && stream->name() == "volume") {
             stream->readNext();
-            volume_val->setValue(stream->text().toInt());
+            volume_val->set_value(stream->text().toInt());
         }
     }
 }
diff --git a/io/media.cpp b/io/media.cpp
index 5c0da7d43..04c1bb2fe 100644
--- a/io/media.cpp
+++ b/io/media.cpp
@@ -1,5 +1,7 @@
 #include "media.h"
 
+#include <QDebug>
+
 extern "C" {
 	#include <libavformat/avformat.h>
 }
@@ -22,3 +24,12 @@ Media::~Media() {
 long Media::get_length_in_frames(float frame_rate) {
 	return ceil((float) length / (float) AV_TIME_BASE * frame_rate);
 }
+
+int guess_layout_from_channels(int channel_count) {
+    if (channel_count == 1) {
+        return AV_CH_LAYOUT_MONO;
+    } else {
+        qDebug() << "[WARNING] Could not detect audio channel layout - assuming stereo";
+        return AV_CH_LAYOUT_STEREO;
+    }
+}
diff --git a/io/media.h b/io/media.h
index d82870380..3d6b2caf4 100644
--- a/io/media.h
+++ b/io/media.h
@@ -40,4 +40,6 @@ struct Media
 	long get_length_in_frames(float frame_rate);
 };
 
+int guess_layout_from_channels(int channel_count);
+
 #endif // MEDIA_H
diff --git a/io/previewgenerator.cpp b/io/previewgenerator.cpp
index 7b9994040..f1bc569f9 100644
--- a/io/previewgenerator.cpp
+++ b/io/previewgenerator.cpp
@@ -51,6 +51,12 @@ void PreviewGenerator::run() {
                 codec_ctx[i] = avcodec_alloc_context3(codec);
                 avcodec_parameters_to_context(codec_ctx[i], fmt_ctx->streams[i]->codecpar);
                 avcodec_open2(codec_ctx[i], codec, NULL);
+
+                if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
+                    if (codec_ctx[i]->channel_layout == 0) {
+                        codec_ctx[i]->channel_layout = guess_layout_from_channels(fmt_ctx->streams[i]->codecpar->channels);
+                    }
+                }
             }
             AVPacket packet;
             bool done = true;
diff --git a/olive.pro b/olive.pro
index 4c714479c..da149b355 100644
--- a/olive.pro
+++ b/olive.pro
@@ -1,108 +1,110 @@
-#-------------------------------------------------
-#
-# Project created by QtCreator 2018-05-11T10:31:59
-#
-#-------------------------------------------------
-
-QT       += core gui multimedia opengl
-
-greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
-
-TARGET = olive
-TEMPLATE = app
-
-# The following define makes your compiler emit warnings if you use
-# any feature of Qt which has been marked as deprecated (the exact warnings
-# depend on your compiler). Please consult the documentation of the
-# deprecated API in order to know how to port your code away from it.
-DEFINES += QT_DEPRECATED_WARNINGS
-
-# You can also make your code fail to compile if you use deprecated APIs.
-# In order to do so, uncomment the following line.
-# You can also select to disable deprecated APIs only up to a certain version of Qt.
-#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
-
-
-SOURCES += \
-        main.cpp \
-        mainwindow.cpp \
-    panels/project.cpp \
-    panels/effectcontrols.cpp \
-    panels/viewer.cpp \
-    panels/timeline.cpp \
-    ui/sourcetable.cpp \
-    dialogs/aboutdialog.cpp \
-    ui/timelinewidget.cpp \
-    io/media.cpp \
-    project/sequence.cpp \
-    project/clip.cpp \
-    playback/playback.cpp \
-    playback/audio.cpp \
-    io/config.cpp \
-    dialogs/newsequencedialog.cpp \
-    ui/viewerwidget.cpp \
-    ui/viewercontainer.cpp \
-    dialogs/exportdialog.cpp \
-    ui/collapsiblewidget.cpp \
-    effects/transformeffect.cpp \
-    panels/panels.cpp \
-    effects/volumeeffect.cpp \
-    effects/paneffect.cpp \
-    project/effect.cpp \
-    effects/effects.cpp \
-    playback/cacher.cpp \
-    io/exportthread.cpp \
-    ui/timelineheader.cpp \
-    io/previewgenerator.cpp
-
-HEADERS += \
-        mainwindow.h \
-    panels/project.h \
-    panels/effectcontrols.h \
-    panels/viewer.h \
-    panels/timeline.h \
-    ui/sourcetable.h \
-    dialogs/aboutdialog.h \
-    ui/timelinewidget.h \
-    io/media.h \
-    project/sequence.h \
-    project/clip.h \
-    playback/playback.h \
-    playback/audio.h \
-    effects/effects.h \
-    io/config.h \
-    dialogs/newsequencedialog.h \
-    ui/viewerwidget.h \
-    ui/viewercontainer.h \
-    dialogs/exportdialog.h \
-    ui/collapsiblewidget.h \
-    project/effect.h \
-    panels/panels.h \
-    playback/cacher.h \
-    io/exportthread.h \
-    ui/timelinetools.h \
-    ui/timelineheader.h \
-    io/previewgenerator.h
-
-FORMS += \
-        mainwindow.ui \
-    panels/project.ui \
-    panels/effectcontrols.ui \
-    panels/viewer.ui \
-    panels/timeline.ui \
-    dialogs/aboutdialog.ui \
-    dialogs/newsequencedialog.ui \
-    dialogs/exportdialog.ui
-
-win32 {
-    LIBS += -L../ffmpeg/lib -lavutil -lavformat -lavcodec -lswscale -lswresample -lopengl32
-    INCLUDEPATH = ../ffmpeg/include
-    RC_FILE = icons/win.rc
-}
-
-linux {
-    LIBS += -lavutil -lavformat -lavcodec -lswscale -lswresample
-}
-
-RESOURCES += \
-    icons/icons.qrc
+#-------------------------------------------------
+#
+# Project created by QtCreator 2018-05-11T10:31:59
+#
+#-------------------------------------------------
+
+QT       += core gui multimedia opengl
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = olive
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+
+SOURCES += \
+        main.cpp \
+        mainwindow.cpp \
+    panels/project.cpp \
+    panels/effectcontrols.cpp \
+    panels/viewer.cpp \
+    panels/timeline.cpp \
+    ui/sourcetable.cpp \
+    dialogs/aboutdialog.cpp \
+    ui/timelinewidget.cpp \
+    io/media.cpp \
+    project/sequence.cpp \
+    project/clip.cpp \
+    playback/playback.cpp \
+    playback/audio.cpp \
+    io/config.cpp \
+    dialogs/newsequencedialog.cpp \
+    ui/viewerwidget.cpp \
+    ui/viewercontainer.cpp \
+    dialogs/exportdialog.cpp \
+    ui/collapsiblewidget.cpp \
+    effects/transformeffect.cpp \
+    panels/panels.cpp \
+    effects/volumeeffect.cpp \
+    effects/paneffect.cpp \
+    project/effect.cpp \
+    effects/effects.cpp \
+    playback/cacher.cpp \
+    io/exportthread.cpp \
+    ui/timelineheader.cpp \
+    io/previewgenerator.cpp \
+    ui/labelslider.cpp
+
+HEADERS += \
+        mainwindow.h \
+    panels/project.h \
+    panels/effectcontrols.h \
+    panels/viewer.h \
+    panels/timeline.h \
+    ui/sourcetable.h \
+    dialogs/aboutdialog.h \
+    ui/timelinewidget.h \
+    io/media.h \
+    project/sequence.h \
+    project/clip.h \
+    playback/playback.h \
+    playback/audio.h \
+    effects/effects.h \
+    io/config.h \
+    dialogs/newsequencedialog.h \
+    ui/viewerwidget.h \
+    ui/viewercontainer.h \
+    dialogs/exportdialog.h \
+    ui/collapsiblewidget.h \
+    project/effect.h \
+    panels/panels.h \
+    playback/cacher.h \
+    io/exportthread.h \
+    ui/timelinetools.h \
+    ui/timelineheader.h \
+    io/previewgenerator.h \
+    ui/labelslider.h
+
+FORMS += \
+        mainwindow.ui \
+    panels/project.ui \
+    panels/effectcontrols.ui \
+    panels/viewer.ui \
+    panels/timeline.ui \
+    dialogs/aboutdialog.ui \
+    dialogs/newsequencedialog.ui \
+    dialogs/exportdialog.ui
+
+win32 {
+    LIBS += -L../ffmpeg/lib -lavutil -lavformat -lavcodec -lswscale -lswresample -lopengl32
+    INCLUDEPATH = ../ffmpeg/include
+    RC_FILE = icons/win.rc
+}
+
+linux {
+    LIBS += -lavutil -lavformat -lavcodec -lswscale -lswresample
+}
+
+RESOURCES += \
+    icons/icons.qrc
diff --git a/panels/project.cpp b/panels/project.cpp
index 54b83c63f..7610289a2 100644
--- a/panels/project.cpp
+++ b/panels/project.cpp
@@ -406,8 +406,6 @@ void Project::load_project() {
             }
             break;
         }
-        qDebug() << "read element:" << stream.name() << "- text:" << stream.text() << "- start:" << stream.isStartElement() << "- end:" << stream.isEndElement();
-
     }
     if (stream.hasError()) {
         qDebug() << "[ERROR] Error parsing XML." << stream.error();
diff --git a/playback/cacher.cpp b/playback/cacher.cpp
index 312dff63f..73915f91b 100644
--- a/playback/cacher.cpp
+++ b/playback/cacher.cpp
@@ -231,13 +231,7 @@ void open_clip_worker(Clip* clip) {
 		// if FFmpeg can't pick up the channel layout (usually WAV), assume
 		// based on channel count (doesn't support surround sound sources yet)
 		if (clip->codecCtx->channel_layout == 0) {
-			switch (clip->stream->codecpar->channels) {
-				case 1: clip->codecCtx->channel_layout = AV_CH_LAYOUT_MONO;
-				default:
-					clip->codecCtx->channel_layout = AV_CH_LAYOUT_STEREO;
-					qDebug() << "[WARNING] Could not detect audio channel layout - assuming stereo";
-					break;
-			}
+            clip->codecCtx->channel_layout = guess_layout_from_channels(clip->stream->codecpar->channels);
 		}
 
 		int sample_format = AV_SAMPLE_FMT_S16;
diff --git a/ui/labelslider.cpp b/ui/labelslider.cpp
new file mode 100644
index 000000000..92749eb1f
--- /dev/null
+++ b/ui/labelslider.cpp
@@ -0,0 +1,75 @@
+#include "labelslider.h"
+
+#include <QMouseEvent>
+#include <QApplication>
+
+LabelSlider::LabelSlider(QWidget* parent) : QLabel(parent)
+{
+    drag_start = false;
+    min_enabled = false;
+    max_enabled = false;
+    setStyleSheet("QLabel{color:#ffc000;text-decoration:underline;}");
+    setCursor(Qt::SizeHorCursor);
+    set_value(0);
+    set_default_value(0);
+}
+
+void LabelSlider::set_value(float v) {
+    if (min_enabled && v < min_value) {
+        internal_value = min_value;
+    } else if (max_enabled && v > max_value) {
+        internal_value = max_value;
+    } else {
+        internal_value = v;
+    }
+    setText(QString::number(v));
+    emit valueChanged();
+}
+
+float LabelSlider::value() {
+    return internal_value;
+}
+
+void LabelSlider::set_default_value(float v) {
+    default_value = v;
+    set_value(v);
+}
+
+void LabelSlider::set_minimum_value(float v) {
+    min_value = v;
+    min_enabled = true;
+}
+
+void LabelSlider::set_maximum_value(float v) {
+    max_value = v;
+    max_enabled = true;
+}
+
+void LabelSlider::mousePressEvent(QMouseEvent *ev) {
+    if (ev->modifiers() & Qt::AltModifier) {
+        set_value(default_value);
+    } else {
+        qApp->setOverrideCursor(Qt::BlankCursor);
+        drag_start = true;
+        drag_start_x = cursor().pos().x();
+        drag_start_y = cursor().pos().y();
+    }
+}
+
+void LabelSlider::mouseMoveEvent(QMouseEvent *ev) {
+    if (drag_start) {
+        set_value(internal_value + (cursor().pos().x()-drag_start_x) + (drag_start_y-cursor().pos().y()));
+        cursor().setPos(drag_start_x, drag_start_y);
+        drag_proc = true;
+    }
+}
+
+void LabelSlider::mouseReleaseEvent(QMouseEvent *ev) {
+    if (drag_start) {
+        qApp->restoreOverrideCursor();
+        drag_start = false;
+        if (drag_proc) {
+            drag_proc = false;
+        }
+    }
+}
diff --git a/ui/labelslider.h b/ui/labelslider.h
new file mode 100644
index 000000000..21ab290de
--- /dev/null
+++ b/ui/labelslider.h
@@ -0,0 +1,37 @@
+#ifndef LABELSLIDER_H
+#define LABELSLIDER_H
+
+#include <QLabel>
+
+class LabelSlider : public QLabel
+{
+    Q_OBJECT
+public:
+    LabelSlider(QWidget* parent = 0);
+    void set_value(float v);
+    void set_default_value(float v);
+    void set_minimum_value(float v);
+    void set_maximum_value(float v);
+    float value();
+protected:
+    void mousePressEvent(QMouseEvent *ev);
+    void mouseMoveEvent(QMouseEvent *ev);
+    void mouseReleaseEvent(QMouseEvent *ev);
+private:
+    float internal_value;
+    float default_value;
+
+    bool min_enabled;
+    float min_value;
+    bool max_enabled;
+    float max_value;
+
+    bool drag_start;
+    bool drag_proc;
+    int drag_start_x;
+    int drag_start_y;
+signals:
+    void valueChanged();
+};
+
+#endif // LABELSLIDER_H