From what I've noticed, it seems that the desktop notification tool when used with NPM only allows you to specify a single audio file to be played when an alert is triggered. Whichever audio file is specified in the notification tool, that file is the one that is played for any alert that is received that requires a sound be played. It would be nice to be able to specify a different audio file to be played for different alerts. More specifically, it would be great to be able to specify a different sound to play for each different node when it goes offline and comes back online.
