I'll be on record and say that the C4 is an amazing pedal, it's just not amazing for me.That’s wild you’ve bought and sold the C4 that many times.
The first time I bought it, I really didn't know what I was doing and I didn't put any time into it, and GAS struck so I sold it. The second time I bought it, I decided that I was going to dedicate some time and effort into learning it, and I found a bunch of cool presets online, and started digging it, but I felt it limited for live use so, sold it. The third and last time I bought it, I needed it for a band that I had just joined, so I also bought the Disaster Area MIDI controller to make it more versatile, and that made a hug difference. The band ended up not happening and I didn't need it anymore, and of course, GAS, so I sold it.
I just never really got into the computer or app based editing. Same goes for the Future Impact, and multiple Helix units that I have owned over the years. Same as the C4 - fantastic gear, ut just not fantastic for me.
It stems from my day job - 25+ years in IT, which means 25+ years staring at a computer screen all day - the last thing that I want to do is to stare at it instead of playing bass