Korg's Synthe-Bass (model SB-100) is a small 2-octave monophonic bass synth that had a very fat sound. It has one oscillator, an AD Envelope and a low-pass filter. No LFO, no arpeggiators or sequencers and certainly no memory. Small and portable, it came in a brief-case design. Unlike many portable synths of the time, it featured full size keys.