If your multitrack program support VST Instruments, you might check out the LM-4 drum module. Its the only thing I have used, but I've been pretty pleased with it. You program in the drums like MIDI and the module plays them. It has layers of drums sounds so a soft hit plays back one drum sample and harder hits play back others.
You can hear it on all my tunes with drums. www.chrisshaeffer.com - follow either link to IUMA or NoWhereRadio. "Come Out and Play" is on both sites and "The Dawn" is on IUMA (probably a better example.)
I like it better than LM4, you can load indivual sounds, or entire kits. You can adjust, volume, tone, envelope, etc. and create and save new kits just by clicking file