vastly improved audio

mainwindow.cpp

@@ -20,6 +20,8 @@
 #include "dialogs/exportdialog.h"
 #include "dialogs/preferencesdialog.h"
 
+#include "playback/audio.h"
+
 #include "ui_timeline.h"
 
 #include <QDebug>
@@ -149,6 +151,8 @@ MainWindow::~MainWindow() {
         config.save(config_dir);
     }
 
+	stop_audio();
+
 	delete ui;
 
     delete panel_project;