The Korg MS-10 is a fantastic monophonic semi-modular synthesizer that can be thought of as the little brother to the famous MS-20. It features the same low-pass filter found in the first generation MS20 (the second generation MS20 used a different filter) but offers only one VCO, LFO, & VCA. What separates this small & simple synth from the others is it retains the same semi-modular patching system found in the MS-20 enabling you to re-direct signal flow allowing many more sound and routing possibilities not found in analog mono-synths at the time.