Boss Dr.Rhythm Rundown : DR-55, DR-110, DR-220A, DR-220E, DR-550, DR-660

Heres a full run down of the first of the Dr.Rhythm series. Starting with the 1979 Boss DR-55, we end with 1992's Boss DR-660. 0:00 Introduction 1:31 DR-55 8:52 DR-110 14:26 DR-220A and DR-220E 19:50 DR-550 25:36 DR-660 30:27 Conclusion