 This type of organ predated, and contributed largely to, the development of modern synthesizers.The combo organ concept, at least in the context of mass-production, is thought to have arisen from popular demand, when smaller home organs were seen in music stores.Combo organs were probably originally developed in the United Kingdom, based on the Univox polyphonic version of the Clavioline, and some models included the inner-workings of Italian-made transistor accordions.