I have been looking for more advanced sequencers than Keystep Pro. So far, the most interesting eurorack option has probably been the NerdSEQ, but I don't like how “grid-based” it is. I tried FH-2 with Squarp Pyramid (with an external keyboard), but I didn't jive with that UI either.
-- ecstatic_sutherland

More advanced than keystep pro?... uh, ok.

I do have some experience with NerdSeq and I love it, because it makes a kind of Metal Gear Solid retro feeling to me.
It is capable of playing back loads of programmed information and modulation (not my video):

But NerdSeq really needs all of my patience, and it feels a bit like programming - I'm also attaching an external display and a computer-keyboard with the expander, haha!
I don't work with external midi-gear but there is a limited option for micro timings in Nerdseq => it affects a whole step in the pattern, not only one note.

Maybe this information helps you.

BTW: whats your goal with the overall rack? Recording, live gigs, improvisation, playing with band...?