Bringing PlaybackWorker to life

The user can play a sound live with a mouse click or a keyboard key. But when he records an awesome beat, the application must be able to play it again with the PlaybackWorker class. Let's see how MainWindow uses this worker. Here is the MainWindow.h related to the PlaybackWorker class:

class MainWindow : public QMainWindow 
{ 
... 
private slots: 
    void playSoundEffect(int soundId); 
    void clearPlayback(); 
    void stopPlayback(); 
    ... 
 
private: 
    void startPlayback(); 
    ... 
 
private: 
    PlaybackWorker* mPlaybackWorker; 
    QThread* mPlaybackThread; 
    ... 
}; 

As you can see, MainWindow has PlaybackWorker and a QThread member variables. Let's see the implementation of startPlayback():

void MainWindow::startPlayback() 
{ 
    clearPlayback(); 
 
    mPlaybackThread = new QThread(); 
 
    mPlaybackWorker = new PlaybackWorker(mTrack); 
    mPlaybackWorker->moveToThread(mPlaybackThread...