One of my ZOIAs is a dedicated modulation/control source for any assignable parameter on all MIDI-capable devices on my board. I can also drop it into the signal chain (Boss ES-8) whenever I want envelope controlled modulation, and enable/disable via MC-8. The complexity of home-cooked modulation ‘algos’ that you can quickly patch up (I often do quick/dirty patches on the fly) is immense.

“Who modulates the modulators?”