Correct me if I'm wrong,but aren't those the samplers that areplaying the sounds?
If I understand the question,he's asking what to use to actually create the beats.
I've recentely started just programming the drums using the piano roll in Ntrack,with the Boss DR 005 soft sampler.I used to use a cheapo step sequence program called PCDrummer ,which bridged the gap between my old Alesis HR16 and software,as far as being a step sequencer.It was far to limited for what I need though.Bite the bullet and just learn to program MIDI in your sequencer and feed it to BFD,or DKFH.I advise against using anything outside your main sequencer,that you have to export wav's into your main sequencer.