the squarp pyramid has a few interesting midi effects which I use, they might provide inspiration for modifiers for the midihub
you’ll see they tend to be either ‘utility’ like (e.g. scale) , or creative (e.g. chance).
some I suspect wont translate, as they interacting with the sequencer, rather than just the raw midi stream, but others I think would. (and they are not particularly complex imo)
(if your interested I think its easier for you to check link, as they have description/parameters etc, rather than me do a poor job listing them here … but if you have any questions how they work, what they are used for in practice - feel free to ping me)