The AM1631 Dual Ring Modulator is not just any Eurorack module, it is a faithful recreation of the legendary Moog Dual Ring Modulator that Keith Emerson commissioned from the renowned Bob Moog back in the 1970s. While there are no original schematics available, the AM1631 uses concepts from the Moog Bode Frequency Shifter and Roland 700 Modular to approximate the circuitry.
The module uses a pair of UA796 modulation ICs and LM301A Op Amps, both in the "can" format, just like the original. This setup delivers an exceptional sound with ringing bell tones that span a wide frequency spectrum. The six front panel jack sockets accommodate the audio inputs and outputs of each ring modulator.
The AM1631 has a small 8HP panel width and a black anodised finish with white lettering. The module is designed to complement the Behringer System 55 Modular System, and it comes with a 10-pin power cable and a set of black M3 screws and washers.
The design of the module, with level controls for the B input of each ring modulator and a red flat-top LED for showing the signal output level, makes it easy to attain desired sound. The Lumberg jack sockets provide a secure connection.
Overall, the AM1631 Dual Ring Modulator is a must-have for anyone who wants to recreate the classic Moog sound. It delivers an unrivaled level of precision and creativity that will enrich any modular synthesis system it becomes a part of.
Example Usage
If you're new to using ring modulation in your modular synth setup, the AM1631 Dual Ring Modulator is a great place to start. Try patching your main oscillator into the A input and a simple waveform, such as a sine or triangle wave, into the B input. Experiment with adjusting the B input level and listen to the striking harmonic content that results. Don't be afraid to also patch in modulation sources, such as an LFO or envelope generator, to the B input for even more complex sounds.
An intermediate-level usage example for the AM1631 Dual Ring Modulator could involve creating a warped bell-like sound using the module. First, start by patching in a sine wave into one of the audio inputs for ring modulator 1, and a triangle wave into the other input. Adjust the level control for the B input to taste, creating the desired harmonic content. Next, patch the output of ring modulator 1 into the input of ring modulator 2, and patch the output of ring modulator 2 into the audio output jack. Adjust the level control for the B input on ring modulator 2, and experiment with the frequencies of the two input waveforms, to create a range of different bell-like sounds. Add modulation to the frequency of one or both input waveforms for even greater sound design possibilities. The AM1631's ability to generate distinctive, shimmering sounds with a classic character can add unique textures to your music productions.
Further Thoughts
The AM1631 Dual Ring Modulator is an excellent choice for creating otherworldly and unconventional sounds. You can use it to achieve extended reverberation effects and to generate complex frequency mixing, thus adding texture to your modular synthesizer patch. For example, you could patch both oscillators into the ring modulators, systematically increasing the level controls for each one until you hear the metallic ringing you desire. Then, tweak the output levels to fine-tune the sound. The result is a unique and versatile effect that adds a touch of vintage flair to your music production.