SequBeat Pro 

SequBeat offers a full virtual drum kit for all of your practicing and songwriting needs. It works as a sequencer for constructing percussion quality sounds. SequBeat comes with the "Power" drum library that features 16 great samples.
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DrumTools Performance Designer 

Instant creation of 1-8 measure drum performances including drum/percussion loops, fills, intros, endings, solo, and then simply trigger them by MIDI notes from your sequencer to easily turn separate performances into complete drum track.
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