Odo - Dr-Fusion v2.0 (free)

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Dr-Fusion 2 is a drum sampler and synth with:
7 instruments with dual samples (kick, 2 snares, 2 percussion, hihat, ride and crash,
2 instruments with dual samples into which the user can load samples,
2 instruments with single sample slots (closed hihats, claps)
2 synths for toms and kicks,
pads (for auditioning), LEDs (for monitoring) and Mute buttons
2 samples can be loaded into many of the instruments for layering (the second sample can be muted), over 560 samples are built in,
each sample-based instrument has a comprehensive set of controls (many can be automated),
tune (1 octave), octaves and volume controls for each sample,
main volume, volume envelope (ADSR), pan,
any one of four FX: Distortion, Filter, Bit Crusher and Clipper, each with their own controls.

The kick, snares, percussion and hihats each have over 120 samples available, there are 61 closed hihats, 30 ride and crashes, and 35 claps

In addition, DR-Fusion has two drum synths, for kick and tom.
And, finally, there are 35 Drum kits presets, and you can set up your own using the integrated samples and synths.