RubberDuck H30+ is a realtime software synthesizer dedicated to electronic dance music. Roughly based on the the well known Roland TB-303, the RubberDuck H30+ synthesis model consists of an oscillator wave with a resonant filter sweep applied to it combined with a simple hardware sequencer design. This resolves into the typical twisted, screaming, bubbling bass sound that is often used in Acid House, Goa Trance, or Techno productions. RubberDuck offers full MIDI support and it can save files in WAV format. Features of RubberDuck include: realtime digital resonant dynamic filters, frequency and volume envelope (DCA, DCF), four basic waveforms, dual oscillator sound generation, a 224-note sequencer, a drum section, and digital delay/feedback/distortion.