Some history on this device: The Alesis SR-16 has been in production since 1991 and has gone through only slight revisions to the hardware since its original release. The 16-bit drum samples are still the same today as they were on this unit over 15 years ago. It is regarded as a break-through piece of studio gear and regarded by many studio engineers as the first rhythm machine capable of producing a convincing enough drum track capable of replacing a real drummer in studio recordings for rock applications. (Prior to the SR-16, rhythm machines were commonly used in pop music in the 80's, but it was always clear to trained ears that a rhythm machine was used, the SR-16 successfully blurred the line and made it possible to use rhythm machines in genres that generally frowned upon electronic drums such as: rock, country and blues) You'll hear the SR-16 on many professional tracks by top name recording artist from the early to mid-90's.