I remember a few years ago, when there wasn't much in the way of reverb in Eurorack format, and in that short time, we've seen several amazing reverb modules come to market. Now, it's an embarrassment of riches!
The R-56 is by far the best spring reverb option available in Eurorack format. What's more, the tube gain stages feature a ton of gain and sound fantastic. Metasonix users had been asking for more and more gain, and the R-56 and R-57 really delivered on that! In addition to the small tank on the front, the cover of which can be removed, allowing the springs to be directly manipulated or disengaged entirely, connections for an external tank are available on the back of the module, allowing one to connect as big of a reverb tank as he or she would like. Voltage control over the signal's drive (making use of a great deal of gain) and analog feedback allows this module to really roar.