First idea is given by Vojtech himself by demonstrating its usage for a Dynamic crossover.
Another possibility is to use it for oscillator processing/bending/wrecking... here's an example: Two MXXX-OSCs are routed through a Math module which provides a simple subtraction.
You'll probably better see the results in this (without sound, sorry). Pay attention to the oscilloscope on the right hand side and watch it changing while some parameters change.

