Your new 111B/1 Dual Reverberation is a fourth generation design, incorporating many new refinements while retaining the distinctive sound quality which made the earlier Orban Reverberation units so successful. The 111B/1 Reverberation contains a number of sophisticated features which contribute greatly to its high performance. As many of these features are not intuitively obvious, this manual should be read and understood in order to obtain the maximum benefit.