Korg Volca Nubass is a bass synthesizer with a sound source based on a vacuum tube oscillator. The Nubass delivers powerful acid bass, representing the classic Acid sound.

The technology allows electronic musicians to simulate any imaginable sound, while the audience seeks the warmth and distortion of vacuum tubes. This distinctive sound has a quality that goes beyond words and sets it apart from the rest, and it cannot be reproduced by a response curve: it is unmistakably the sound of a tube.

The Volca Nubass is the first analog synthesizer equipped with a next-generation Nutube tube in its oscillator. The vacuum tube and analog design result in a warm, thick, and rich sound. The scaled filter offers the character of classic bass machines, along with overdrive and massive distortion.

The Nutube contains two triodes: one is used in the oscillator to generate a sawtooth or square waveform. The other is used in the sub-oscillator's Drive circuit, adding depth and warmth an octave below the oscillator. This oscillator and sub-oscillator feature a circuit design that delivers the harmonic character that only a real tube can provide.

The Volca Nubass is equipped with a complete 16-step sequencer with a wide variety of functions; when used with a drum machine, it is possible to create rhythm tracks or loop-based music.

The 16 buttons can be used to enter steps like the rest of the Volca series, or the buttons can be played like a keyboard to record in real time. The Chain function allows multiple patterns to be played successively, with up to 16 sequences that can be chained together.

The Motion Sequence function can record controller movements, applying parameter changes to the sound during the pattern. This can be used when creating loops or to achieve dynamic and original live performances. Up to 16 patterns with motion sequences can be stored in the internal memory.

There is also an Active Step function that allows specific steps in the sequence to be skipped during playback; patterns become more dynamic and exciting when they can be edited in real time during a live performance.