How to use volume up and down - virtual volume device - rule machine?

I setup a virtual volume device to control my racked audio equipment. I want to be able to trigger things from the virtual volume device but I cannot find anyway to expose volume up and down in the rule machine?

Also, related question, every time I try to create a new rule in rule machine I often find myself digging around in the triggers trying to find the right one. Is there anyway to look at a device and see all of the triggers possible with it? Thanks.

You will want the trigger to be a change in the volume of your virtual device.

Here is a rule that will work:

In this example, it just sets the volume of another device. You can setup any action to run instead…

Here is how you setup the trigger from the example:

Every device’s attribute can be used as a trigger.

Thanks - I was looking for the buttons in the virtual audio volume device as triggers. It didn't occur to me to test for increase or decrease.