The Black-Noise Sallen Key Eurorack module is a tribute to the iconic KORG MS-20 filter, and it does not disappoint. This module is composed of a 2 Poles Low Pass and a 1 Pole High Pass. Unlike the original MS-20 filter, Black-Noise added a cross-fader, allowing users to blend the Low Pass and High Pass filters to create complex filtering.
What makes this filter unique is its non-linear feedback path, which enables it to avoid clipping when self-oscillating while also providing a distinctive color. Rather than using diodes, the module features integrated LEDs, which slightly alter the resonance color while giving positive feedback about the drive of the resonance path.
The Sallen Key is a capable sound source unto itself, thanks to its ability to self-oscillate, and its tracking is accurate across six octaves. This module has been designed to honor the MS-20 filter, while also adding new and distinctive features that help it stand out.
The Black-Noise Sallen Key pays homage to the classic KORG MS-20 filter, and it does so in style. It packs a host of new features, including the cross-fader, while also retaining the unique non-linear feedback path that made the original filter so beloved.
Overall, the Black-Noise Sallen Key Eurorack module is an excellent addition to any modular synthesizer. The thought and care put into this specific design are apparent, and they have produced a module that can stand on its own or pay homage to a classic filter.
Example Usage
If you're new to using filter modules, the Black-Noise Sallen Key Eurorack Module is a great place to start. Simply insert it into your signal chain and use the knobs to adjust the low pass and high pass filters separately or blend them together with the crossfader to create unique filtering effects. Turn up the resonance knob to add some color to your sound, and experiment with the LED feedback to see how it affects the resonance path. Don't forget to try out its self-oscillating capabilities and play around with the accurate tracking across six octaves to create some interesting sounds.
An intermediate-level example of using the Black-Noise Sallen Key Eurorack module could be creating a complex and evolving filter sweep on a bass synthesizer patch. First, patch the bass sound into the module's input, and then patch the output into a mixer or another module. Dial in the Low Pass and High Pass filter settings to find a balance that suits the sound you're going for. Next, engage the crossfader and slowly move it back and forth to create a filter sweep that shifts between the Low Pass and High Pass filters. Experiment with the resonance and drive controls to add some grit and saturation to the sound. Finally, use an LFO to modulate one or more of the filter parameters to create a constantly evolving, dynamic sound. With the non-linear feedback path and LED feedback, the Black-Noise Sallen Key filter module can add a unique and colorful character to your bass synthesis patches.
Further Thoughts
The Black-Noise Sallen Key Eurorack Module offers a unique and iconic MS-20 filter tribute that can be used for complex filtering. With a non-linear feedback path and the ability to self-oscillate, it can also be used as a sound source. One way to use this module creatively is to route an LFO to the crossfader and create evolving and dynamic filter sweeps. The LED feedback information can also be used to visually enhance live performances, adding to the overall experience. The accurate tracking across six octaves allows for a high degree of control and precision, making this module a must-have for any electronic musician looking to add unique and complex filtering to their sound.