The Aeon Labs Doorbell is my favorite device which is why I created the device handler @JDRoberts posted and the stripped down version of it which I’ve submitted to be published.
The full version can easily be used with SHM and Notify with Sound, but there’s sometimes a 1-3 second delay before the mp3 starts playing and you can’t play a second mp3 until the first one stops playing.
The other device handler allows you to use it as a switch to play a specific mp3, and a alarm to play another, but to play them by track number you’ll need to use Rule Machine and setup custom commands. The delay isn’t as bad with this version and it allows you to cut off a playing mp3 by playing another.
Long story short, if you’re using one of these devices to play an mp3 when a door is opened and a different mp3 when that door is closed, don’t expect it to always work perfectly. especially when SmartThings is running slowly.