Cascade: Are Spawn PerUnit and Emitter Direct location compatible?

I am attempting to spawn particles after an accelerating Mesh Particle. I’ve created an emitter (Sparks_Trail) and assigned an Emitter Direct Location Module and a Spawn PerUnit module to it. Despite inputting the name of the Mesh Emitter that I want it to follow, no particles are spawning after the moving mesh particle. I’ve tried tweaking the values in the Spawn PerUnit module, but to no avail. Are these two modules incompatible, or am I simply overlooking something?