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.