title: Continuous warning sound in Qt?
body: <p>What is the easiest way to play a continuous warning sound that lasts several minutes without affecting the main thread's performance?
  I know that QSound can work in asynchronous mode, however, according to here:
  <a href="https://stackoverflow.com/questions/5600515/qt-how-to-play-sound-witout-blocking-main-thread">Qt: How to play sound witout blocking main thread?</a>
  QSound would still bring noticeable affect on the main thread.</p>
  
  <p>Is there any simple solution to this? </p>