Korg Σ (Sigma)

Korg Σ (Sigma) is a digital synthesizer released by Korg in 1985. It was the first digital synthesizer to feature a built-in sequencer and was used by many popular musicians, including Depeche Mode, The Cure, and New Order.

The Korg Σ (Sigma) is a subtractive synthesizer, meaning it uses oscillators to generate sound and then filters to shape the sound. It has two oscillators, two envelope generators, two low-frequency oscillators, and a noise generator. It also has a built-in 16-step sequencer, allowing users to create complex patterns and sequences. The Korg Σ (Sigma) also features a variety of effects, including chorus, delay, and reverb.