By request I put together a video demonstrating FL Studio's Peak controller.
Peak controller is for if you would like to automate or duck specific EQ bands when a kick comes into play, or affect any other parameter by audio input control. You can even use sound input to modulate other sounds, e.g. the wavetable position on Massive, or the routing on FM8.
I consider myself fairly versed in the technical aspects of FL Studio and many NI Products, so if you would like a technique or tutorial covered visually, feel free to request it.