I have sib4 and jabb and am wondering how I can add vibrato to my sounds?
I'm not familiar with sib4 but vibrato in JABB is a combination of cc17 (speed)and aftertouch (intensity). Aftertouch should be varied as the note sounds. Most sequencers and Notation programs support adding these midi messages.
Alternately the Performance Patches available here Mike's K2 Scripts
will add user definable vibrato for you