Sonar & Pulse Effect. Multiple Post Processing Material Instances of the same Parent, how?

I’m working on a game where sound creates a post process pulse effect which illuminates the environment. For the life of me I can’t figure out how to have more than one of these pulse effects happening at the same time. If i attempt to modify the pulses values through the Material Parameter Collection it just modifies the pulse that is already active. How can I create a dynamic instance of my PP pulse effect and create as many of them as I need?