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DrumGizmo is an open source cross-platform drum plugin. It is comparable to several commercial drum plugin products.
Features include:
Open drumkit file format, allowing the community to create their own drumkits
Drum velocity, allowing for several different hit velocities for each drum
16 channel output, making it possible to mix it just the way you would a real drumkit
Optional built-in humanizer, analyzing the midi notes, adjusting velocities on-the-fly