The Akai CS-50 is a vintage analog synthesizer produced in the 1970s. It is a monophonic synthesizer with a 49-note keyboard and a built-in 16-step analog sequencer. The CS-50 features two voltage-controlled oscillators (VCOs), a voltage-controlled filter (VCF), and an amplifier with voltage-controlled amplifier (VCA). It also has various modulation options, including an LFO and an envelope generator. The synthesizer has a distinctive sound and is sought-after by musicians and collectors.