A powerful bass synth with a sound source based around a vacuum tube oscillator.The acid bass machine with the pinnacle of modulation and distortion.Even today, when digital technology allows electronic musical instruments to simulate any sound imaginable, people seek the warm harmonics and distortion produced by analog vacuum tubes. This distinctive sound has a quality beyond words that sets it apart, and cannot be captured by a response curve; it's the unmistakable sound of tubes.The volca nub..