Okay, try this:
SmartApp Replacement: https://gist.github.com/chuckpearce/a08f3886e8df0622b9fa
DeviceType Replacement: https://gist.github.com/chuckpearce/e0c9a1f9eb9859bc9c7c
Sound Type Reference: Aeon Labs Aeotec Z-Wave Siren
I haven’t tested this at all so be warned.
Basically it should have a new menu in Notifications just under the Pushbullet notifications. Enable “Enable Aeotec features mode” then set the sound and volume for each item you want to have a custom sound and volume.
The basic alarm sound and volume is required in order to enable any of the other custom sounds/volumes.