araucann is a synthesizer.
It offers frequency modulation, amplitude (ring) modulation, phase modulation, additive and subtractive synthesis techniques, all at the same time. It has 6 filtered oscillators modulated by 32 envLFOs (envelopes and LFOs that interact with each other).
araucann does not rely on presets. It is completely randomizable and produces very complex and unique sounds at the push of a button.
more info here.
(The sounds in the samples were created using araucann only. no other synths or effects were used)