Drum machine sequencers are incredibly varied in operation. Even within a single company’s range there can be many different styles of workflow. I love the way the R-70 ran, but can’t stand the R8 to the point of not using it at all (it’s sounds are horrible to my taste, including the cards). The RY-30 has a little bit more usable sequencer but really excels as a drum module with a MIDI channel processor built-in. I’m currently hunting for the rack version of it after mine sorta died. The Rhythm Wolf has a really fun drum sequencer that I use along side my Pyramid and BSP. Running more than three drum machines starts to get messy I feel.
I’ve spent a long time trying to find a good realtime drum sequencer but feel as though the search is over with the Pyramid added to the RWolf and BSP. Perhaps in the future I’ll find a drum sequencer that will slot in with those three, but I’m pretty sorted as I am now, with my eyes looking to sequencerless drum modules as future percussion expansions.