Lost message sound

I tried custom icon of my critical message. But I lost my critical sound.

Code:

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QMessageBox msg(this);
//msg.setIcon(QMessageBox::Critical);
msg.setIconPixmap(QPixmap(":/daemon.png"));
msg.setWindowTitle("Gagal");
msg.setText("Test aja");
msg.exec();

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Yes, because a critical sound is only played with a message box tagged as critical. If you use a custom icon, there no idea about what kind of message box you are showing, so no sound is output.