Used KORG OPSIX 37-key synthesizer in great condition, offering six-operator FM synthesis with subtractive, additive, and analog-style sound design. Features include 37 velocity-sensitive keys, 32-voice polyphony, a vivid OLED display, and real-time controls for deep sonic exploration. This powerful synth combines classic FM tones with modern workflows, ideal for studio or stage use. Perfect for producers and synth enthusiasts seeking a versatile sound engine with hands-on creativity and excellent playability.