of the pre-programmed rhythm patterns. In 1978, Roland released the Roland CR-78, the first microprocessor-based programmable rhythm machine, with four memory storage for user patterns. In 1979, a simpler version with four sounds, Boss DR-55, was released. Drum sound synthesis A key difference between such early machines and more modern equipment is that they use sound synthesis rather than digital sampling in order to generate their sounds. For example, a snare drum or maraca sound would typically be created using a burst of white noise whereas a bass drum sound would be made using sine waves or other basic waveforms. This meant that while the resulting sound was not very close to that of the real instrument, each model tended to have a unique character. For this reason, many of these early machines have achieved a certain "cult status" and are now sought after by producers for use in production of modern electronic music, most notably the Roland TR-808. Digital sampling The Linn LM-1 Drum Computer, released in 1980 at $4,995 (), was the first drum machine to use digital samples. It also featured revolutionary rhythmic concepts such as swing factors, shuffle, accent, and real-time programming, all of which have since rooted themselves in beat box technology. Only about 500 were ever made, but its effect on the music industry was extensive. Its distinctive sound almost defines 1980s pop, and it can be heard on hundreds of hit records from the era, including The Human League's Dare, Gary Numan's Dance, Devo's New Traditionalists, and Ric Ocasek's Beatitude. Prince bought one of the first LM-1s and used it on nearly all of his most popular albums, including 1999 and Purple Rain. Many of the drum sounds on the LM-1 were composed of two chips that were triggered at the same time, and each voice was individually tunable with individual outputs. Due to memory limitations, a crash cymbal sound was not available except as an expensive third-party modification. A cheaper version of the LM-1 was released in 1982 called the LinnDrum. Priced at $2,995 (), not all of its voices were tunable, but crash cymbal was included as a standard sound. Like its predecessor the LM-1, it featured swappable sound chips. The LinnDrum can be heard on records such as The Cars' Heartbeat City and Giorgio Moroder's soundtrack for the film Scarface. It was feared the LM-1 would put every session drummer