Thank you for posting that link. I've been out of the effects loop for about four years, in which time I've learnt:
i) Chase Bliss released their "exp"

ii) Chase Bliss went direct-only some time in 2022.
Unfortunately, I don't have any experience of that pedal itself, so my post here is of little-to-no value.

But I find it interesting that CBA's own
overview video only shows it being operated by hand, rather than by foot. (Okay, that allows the viewer to see better what's going on on a video, but still...)
I wonder how good I'd be able to get at making small changes using just my foot.
On another of my boards, I use an expression controller that I made about five years ago using a slightly larger diameter knob borrowed from some production pedal (MXR?), attached to a potentiometer in a Hammond 1590LB case, with the axle of the pot vertical.
View attachment 5319640
That requires a similar to-and-fro motion to operate when using feet, and I've found that I lack the fine control that I can otherwise achieve when using a treadle.
Granted, the wheel on the CBA exp is of even greater diameter and therefore easier to make fine adjustments on.
And I'm not saying that others
can't achieve the fine motor control required. And I don't doubt for a second that Joel Korte and his team worked hard to develop a very practical, usable device... but I'm also curious about other people's IRL experiences with CBA's "exp" on floor-based boards.