The Koma Elektronik Poltergeist is a digital effects processor for creating and manipulating sound. It is designed to be used in live performance and studio production, and it features a wide range of effects including delay, reverb, distortion, pitch shifting, and more. It is capable of creating complex soundscapes and textures, and it has a built-in sequencer for creating rhythmic patterns. The Poltergeist is designed to be used with any synthesizer, sampler, or other sound source.