The Chamberlin Rhythmate 40 is an extremely rare tape loop based drum machine. From what is known, only a handful of the model 40's were ever produced, all during the mid-to-late 1970s. This Rhythmate still has its original tape set. All tapes are intact and work with all settings (1 through 14 and A, B, and C variations). According to Wikipedia, approximately only ten (10) of these were ever made.