HY-Poly is a subtractive type polyphonic synthesizer with midi effects and audio effects. And many of synth and audio fx parameters can be modulated. You can create a wide variety of synth sounds with those midi/audio fx and modulations.
There are 8 midi fx units available(Arpeggiator, Octave, Transpose, Harmonizer, Scaler, Velocity, Note Chance, Note Echo).
HY-Poly (Full version) supports 25 audio fx units available.
There are two versions available a full-price version for $60 and a limited free. In the free Version you get to use 1 oscillator mode with a maximum number of voices is 4, there are no midi effect units, and you can use 5 audio effect units