That should work just fine. But, if you'd prefer to play the chime sound through MC itself (maybe for volume level reasons), the easiest method will be to:
* Import Chimes.wav into MC
* Make a second zone in MC for chime Playing (this will prevent the current Playing Now list from getting messed up).
* Instead of playing the chimes directly in the script, you'd play it in MC on this alternate zone
* After the chimes.wav has played, then switch back to the regular zone and resume, just like this one does.
However, that won't be quite as reliable because there's no easy way to tell when MC is done playing the file (which I can do with the wmPlayer control). So, you'll just have to sleep the script for 1200 ms. If you ever change the Chimes.wav out for a different length file, you'd have to modify the script, and I think it'll be a bit more fragile.
So, if you can use the one I posted above, that would probably be a better choice.