Valhalla Supermassive is a reverberator which emulates large spaces. They had a filter, a spring reverberator, and several tape recorders. George Flack is the Paris correspondent for an American scandal sheet called "The Reverberator". The differences between a reverberator and a spiral wave are considered below in detail. The Hammond Organ included a built-in spring reverberator. Ehsaan is also endorsed by Neunaber Audio and currently uses an Immerse Reverberator pedal. In 1981 AMS released the RMX-16 digital reverberator. In that year the short novel "The Aspern Papers" and "The Reverberator" were published. A reverberator appears a result of a rupture in the front of a plane autowave.