I have a chop network where I take some static geometry and modify it's tz channel with a wave chop. I've done this as I've seen on several examples here via a lookup chop.

The thing that I want to add to this is to have the wave “ripples” start when a trigger goes off. I have a trigger sop that goes off when an attribute reaches a certain value. But I don't know how to make that trigger drive the animation (amplitude/phase) of the wave.

Thanks.

can you upload your scene, that doesn't make sense

perhaps you can consider using chopf() function to look up the wave value? You can either use global frame or some sort of time/age variable to looking up the wave value.

The easiest way is maybe that if your trigger is an integer with values 1 and 0 you can use a switch node in your chop network to activate a certain part of the network.