A look at the Korg Σ (Sigma / KP-30) from 1979, a rare and strange monophonic performance synthesizer with two joysticks. We discuss its features and history and listen to its suprising sound. Gear used: Korg Σ (1979) Korg MS-20 Mk I (1978) Korg KR-55B (1982) Korg KPR-77 Samples (1983) Korg DDM-110 (1985) Korg SQ-1 (2015) Seekers Voice Spectra Vocoder (00s) Squier Jagmaster Vista (1997) Evans Sound Creator Nova 400 (70s)