Metasonix R-56 Vacuum-Tube Reverb

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Page last updated Mar 30, 2026

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The Metasonix R-56 Vacuum-Tube Reverb is a unique addition to any modular synthesizer setup, offering a distinct character that only vacuum tubes can provide. This module is not your typical digital reverb; it employs pure vacuum tube technology to deliver a warm, rich, and organic sound that analog enthusiasts crave. The R-56 is designed to integrate seamlessly into your existing modular rig, providing a creative tool for musicians who seek out-of-the-box reverb effects.

Unlike conventional reverb units, the R-56 is known for its ability to produce a wide range of reverb textures, from subtle, airy echoes to deep, cavernous spaces. It features two vintage-style pentode vacuum tubes, adding harmonic richness and depth to your sound. This module is particularly favored by experimental musicians and sound designers who appreciate its capacity to create unique soundscapes.

The R-56's design includes an integrated feedback control, allowing users to push the reverb to extreme levels, leading to unpredictable and exciting results. Its interface is straightforward, ensuring ease of use while maintaining the capability for complex sound manipulation. Perfect for those looking to add a vintage touch to their modern modular setup, the Metasonix R-56 is a testament to the enduring appeal of analog technology in the digital age.

Key Features:

Pure vacuum tube reverb module for modular synthesizers
Utilizes two pentode vacuum tubes for rich harmonic textures
Integrated feedback control for creative sound exploration
Suitable for a wide range of reverb effects, from subtle to extreme
Ideal for experimental musicians and sound designers seeking unique soundscapes

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botstein

828

over 11 years ago

The R-56 is an unique all-analog reverb effect.

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.