diff --git a/widget/mainwindow.cpp b/widget/mainwindow.cpp
index f2f1296..ea9ca1e 100644
--- a/widget/mainwindow.cpp
+++ b/widget/mainwindow.cpp
@@ -14,6 +14,7 @@
 #include <QListView>
 #include <QTime>
 #include <QMessageBox>
+#include <QSortFilterProxyModel>
 
 #include <portaudio.h>
 #include <libopenmpt/libopenmpt.hpp>
@@ -24,12 +25,14 @@ MainWindow::MainWindow(QWidget *parent)
     , m_player(new Player(this))
     , m_playlistManager(new PlaylistManager(this))
     , m_instrumentsModel(new InstrumentsModel(m_player, this))
+    , m_playlistFilderModel(new QSortFilterProxyModel(this))
 {
     ui->setupUi(this);
     ui->plainTextEdit->setFont(Util::defaultMonoFont());
     ui->instrumentsListView->setFont(Util::defaultMonoFont());
     ui->instrumentsListView->setModel(m_instrumentsModel);
-    ui->playlistView->setModel(m_playlistManager->model());
+    m_playlistFilderModel->setSourceModel(m_playlistManager->model());
+    ui->playlistView->setModel(m_playlistFilderModel);
     setWindowIcon(QIcon(":/icons/dist/pineapple-tracker-player.svg"));
 
     m_playlistManager->setAutoLoadFilterSuffixes({"*.xm", "*.it", "*.mod", "*.s3m", "*.mptm"});
@@ -43,8 +46,8 @@ MainWindow::MainWindow(QWidget *parent)
     });
 
     connect(m_player, &Player::fileLoaded, this, [this](){
-        ui->horizontalSlider->setMaximum(m_player->totalOrders() - 1);
-        ui->horizontalSlider->setValue(m_player->currentOrder());
+        ui->playbackSlider->setMaximum(m_player->totalOrders() - 1);
+        ui->playbackSlider->setValue(m_player->currentOrder());
         ui->songTitle->setText(m_player->title());
         const QString & artist = m_player->artist();
         ui->label_4->setText(artist.isEmpty() ? m_player->tracker() : (m_player->artist() + " (" + m_player->tracker() + ")") );
@@ -58,8 +61,8 @@ MainWindow::MainWindow(QWidget *parent)
     });
 
     connect(m_player, &Player::currentOrderChanged, this, [this](){
-        QSignalBlocker sb(ui->horizontalSlider);
-        ui->horizontalSlider->setValue(m_player->currentOrder());
+        QSignalBlocker sb(ui->playbackSlider);
+        ui->playbackSlider->setValue(m_player->currentOrder());
     });
 
     connect(m_player, &Player::currentRowChanged, this, [this](){
@@ -70,13 +73,30 @@ MainWindow::MainWindow(QWidget *parent)
                              ));
     });
 
-    connect(ui->horizontalSlider, &QSlider::valueChanged, this, [this](int value){
-        m_player->seek(ui->horizontalSlider->value());
+    connect(m_player, &Player::gainChanged, this, [this](){
+        // only update the icon of the mute button here.
+        int32_t gain = m_player->gain();
+        QString iconText;
+        if (gain < ui->volumeSlider->minimum()) {
+            // muted
+            iconText = "audio-volume-muted";
+        } else if (gain <= -1000) {
+            iconText = "audio-volume-low";
+        } else if (gain <= 0) {
+            iconText = "audio-volume-medium";
+        } else {
+            iconText = "audio-volume-high";
+        }
+        ui->muteButton->setIcon(QIcon::fromTheme(iconText));
+    });
+
+    connect(ui->playbackSlider, &QSlider::valueChanged, this, [this](int value){
+        m_player->seek(ui->playbackSlider->value());
         QToolTip::showText(QCursor::pos(), QString::number(value), nullptr);
     });
 
-    connect(ui->horizontalSlider_2, &QSlider::sliderMoved, this, [this](int value){
-        m_player->setGain(ui->horizontalSlider_2->value());
+    connect(ui->volumeSlider, &QSlider::sliderMoved, this, [this](int value){
+        m_player->setGain(ui->volumeSlider->value());
         QToolTip::showText(QCursor::pos(), QString("%1 dB").arg(value / 100.f), nullptr);
     });
 
@@ -149,8 +169,9 @@ void MainWindow::on_playlistBtn_clicked()
 
 void MainWindow::on_playlistView_activated(const QModelIndex &index)
 {
-    m_playlistManager->setCurrentIndex(index);
-    playFiles({m_playlistManager->urlByIndex(index)});
+    QModelIndex sourceIndex(m_playlistFilderModel->mapToSource(index));
+    m_playlistManager->setCurrentIndex(sourceIndex);
+    playFiles({m_playlistManager->urlByIndex(sourceIndex)});
 }
 
 
@@ -182,3 +203,22 @@ void MainWindow::on_actionAbout_triggered()
     infoBox.exec();
 }
 
+
+void MainWindow::on_filterEdit_textChanged(const QString &arg1)
+{
+    m_playlistFilderModel->setFilterFixedString(arg1);
+}
+
+
+void MainWindow::on_muteButton_clicked()
+{
+    if (QGuiApplication::queryKeyboardModifiers().testFlag(Qt::ShiftModifier)) {
+        m_player->setGain(0);
+        ui->volumeSlider->setValue(0);
+        return;
+    }
+
+    bool isMuted = m_player->gain() < ui->volumeSlider->minimum();
+    m_player->setGain(isMuted ? ui->volumeSlider->value() : std::numeric_limits<std::int32_t>::min());
+}
+
diff --git a/widget/mainwindow.h b/widget/mainwindow.h
index e4abfc7..6656cd8 100644
--- a/widget/mainwindow.h
+++ b/widget/mainwindow.h
@@ -6,6 +6,7 @@ QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
 class QDragEnterEvent;
 class QDropEvent;
+class QSortFilterProxyModel;
 QT_END_NAMESPACE
 
 class Player;
@@ -30,12 +31,14 @@ private slots:
     void on_messageBtn_clicked();
     void on_playlistBtn_clicked();
     void on_playlistView_activated(const QModelIndex &index);
-
     void on_actionAbout_triggered();
+    void on_filterEdit_textChanged(const QString &arg1);
+    void on_muteButton_clicked();
 
 private:
     Ui::MainWindow *ui;
     Player * m_player = nullptr;
     PlaylistManager * m_playlistManager = nullptr;
     InstrumentsModel * m_instrumentsModel = nullptr;
+    QSortFilterProxyModel * m_playlistFilderModel = nullptr;
 };
diff --git a/widget/mainwindow.ui b/widget/mainwindow.ui
index 46e2d62..f4eaf51 100644
--- a/widget/mainwindow.ui
+++ b/widget/mainwindow.ui
@@ -33,14 +33,14 @@
      </widget>
     </item>
     <item>
-     <widget class="QSlider" name="horizontalSlider">
+     <widget class="QSlider" name="playbackSlider">
       <property name="orientation">
        <enum>Qt::Orientation::Horizontal</enum>
       </property>
      </widget>
     </item>
     <item>
-     <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1,0">
+     <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1,0,0">
       <item>
        <widget class="QPushButton" name="playButton">
         <property name="text">
@@ -62,7 +62,20 @@
        </spacer>
       </item>
       <item>
-       <widget class="QSlider" name="horizontalSlider_2">
+       <widget class="QPushButton" name="muteButton">
+        <property name="text">
+         <string/>
+        </property>
+        <property name="icon">
+         <iconset theme="audio-volume-high"/>
+        </property>
+        <property name="flat">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QSlider" name="volumeSlider">
         <property name="minimumSize">
          <size>
           <width>90</width>
@@ -70,7 +83,7 @@
          </size>
         </property>
         <property name="minimum">
-         <number>-1500</number>
+         <number>-2000</number>
         </property>
         <property name="maximum">
          <number>1000</number>
@@ -109,9 +122,15 @@
         <property name="text">
          <string>Playlist</string>
         </property>
+        <property name="checkable">
+         <bool>true</bool>
+        </property>
         <property name="flat">
          <bool>true</bool>
         </property>
+        <attribute name="buttonGroup">
+         <string notr="true">buttonGroup</string>
+        </attribute>
        </widget>
       </item>
       <item>
@@ -119,9 +138,18 @@
         <property name="text">
          <string>Message</string>
         </property>
+        <property name="checkable">
+         <bool>true</bool>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
         <property name="flat">
          <bool>true</bool>
         </property>
+        <attribute name="buttonGroup">
+         <string notr="true">buttonGroup</string>
+        </attribute>
        </widget>
       </item>
       <item>
@@ -129,9 +157,15 @@
         <property name="text">
          <string>Instruments</string>
         </property>
+        <property name="checkable">
+         <bool>true</bool>
+        </property>
         <property name="flat">
          <bool>true</bool>
         </property>
+        <attribute name="buttonGroup">
+         <string notr="true">buttonGroup</string>
+        </attribute>
        </widget>
       </item>
      </layout>
@@ -181,6 +215,16 @@
         <item>
          <widget class="QListView" name="playlistView"/>
         </item>
+        <item>
+         <widget class="QLineEdit" name="filterEdit">
+          <property name="placeholderText">
+           <string>Type to filter by keyword</string>
+          </property>
+          <property name="clearButtonEnabled">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
        </layout>
       </widget>
       <widget class="QWidget" name="instrumentsPage">
@@ -252,4 +296,7 @@
  </widget>
  <resources/>
  <connections/>
+ <buttongroups>
+  <buttongroup name="buttonGroup"/>
+ </buttongroups>
 </ui>