Particle preset manipulation

What is a scaler, and some of the other expression nodes in the setups, and more importantly, how do you use them? I can’t seem to find any tutorials about them, nor is there anything specific in the Help file? I’ve tried finding the expression in the animation window and backwards tracing to find where the controller is, but I’m not having much luck. :sob:

I think that @Sinan covered some of this in his Logik Live ep on Particles:

Ah, unfortunately I can’t get my brain to work out how those setups were created. The creator of the setups have a certain way that he sets them up but I can’t understand them either. I end up creating what I need from scratch.
Hit me if you need anything specific on the particles.