The Frap Tools Usta sequencer would work great with the voices you have.
And it's beautifully crafted hardware. Just a gem.For me though, fixed step sequencers can get boring after a while.
NerdSeq can do everything, if you manage to figure it out. Don't know if I ever will.
If you want unique/musical/odd/depth, Eventide Misha does really fun things driving a three voice system.-- noodle_hut
The Usta looks good - I've definitely realised I'm pretty limited with those sequences. Was also looking at an Erica Black. NerdSeq doesn't really appeal, the Misha looks interesting though.