Rez3 is a Resonator, it offers a multi LFO with 6 different waveforms and an envelope follower to modulate tone, feedback, filter cutoff and filter resonance.
Further it provides 6 independent resonator voices where the first of it is the master and all others can be detuned to the master note, each voice is also equipped with a pan slider and a range button which you can use to set the detune range between one octave and one semitone.
The built in keyboard allows you to play notes directly or you can use your hostsequencer or midikeyboard to play notes.
Rez3 comes with 32 Presets. Parameters are also equipped with a midi learn function (right click on the parameter) to use it with your midi controller.