It’s a mental pedal. I was a beta tester for it and I still have only scratched the surface. It’s the first pedal where I’ve felt totally overwhelmed with options. If you were thinking you only used 10% of the FI’s functions, the figure for this pedal could well be lower.
Here are a few clips I made with mine that may help your sale.
Here’s the octave down signal in various positions of its tone knob:
https://drive.google.com/file/d/19MrC_dXLWOqQ4-SvB28naEi1XN-UHtnT/view?usp=drivesdk
Here’s octave down with the octave fuzz through a 3Leaf Chromatron filter:
https://drive.google.com/file/d/1G2cfFJRPGERFDJApClqAmblohX3ac7aN/view?usp=drivesdk
The more functionality the MIDI controller has (ability to send CC messages on button presses, etc) the more functionality you’ll be able to squeeze out of the C4. It’ll give you access to stuff that is under the hood and make it easier to use.
Morningstar also do a smaller MC3.