A few have tried to get these modular Midi controllers off the ground - but few seems to succeed.
This one looks nice, I like the the orbiter control - nice to have something a bit different, and it looks really slick.
But like other solutions, the price escalates quickly once you get a few modules. Made worst by the fact their individual modules have only 3 controls on each.
What I think we need is an open standard modular midi controller - so smaller manufacturers could produce - a bit like eurorack.
I could imagine a module system where they could connect together using usb and each have a small Arduino in to alllow chaining.
The trick would be a small usb male connector so each module can connect flush to another.
usb is ideal since it’s an existing standard, so could interconnect existing controllers and can also provide both data and power - no need to reinvent the wheel with proprietary connections