BFD is played as a MIDI track on your sequencer, either by using a keyboard as a MIDI controller to play a drum set, or picking out the groove you want, then applying BFD for both 'MIDI in' and 'MIDI out' on that MIDI track, and record it.
On playback, keep MIDI out as BFD, change MIDI in to 'not connected', as you want the recorded MIDI track to 'play' the BFD virtual synthesizer ('cause that's what it really is after all).
The above is with Cubase, I don't know the terms in the other sequencers but I suspect they're similar.
thanks for the help guys.
just looking and its really weird i cant see the product in the steinberg web site? its called cubasis vst ce. its obviously a budget version of cubase, it came with my soundblaster coundcard. anyway ive figured out how to work the vst instruments in cbasis and sonar 4. but my outboard vsts dont seem to work when i select them. mainly bfd. can someone help?