Electronic music enthusiasts are always in hunt for advanced sound sculpting techniques that push the boundaries of their sonic exploration. Cases in point: multi-mode filters and LFOs. In this article, we will explore some of the most impressive, versatile, and precise multi-mode filters and LFOs combinations in Eurorack systems. Eurorack enthusiasts have chosen some of the best modules out there: Cwejman MMF-2, Erica Synths Drum Modulator, Sacrament Modular Cursible, Toppobrillo Multifilter 2, and Erica Synths Black Low Pass VCF.
Let's begin our sound exploration with the Cwejman MMF-2. This module offers a stereo multi-mode filtering system, saturation, and mix controls that let you modify your sound materials in multiple ways. This filter can be used as a post-production filter that applies mix and pre/post saturation or as an experimental tool with both mono and stereo audio inputs. The MMF-2 has three functional blocks: filter, saturation stage, and mix.
The filter features two four-pole multi-mode filters that offer six selectable outputs for the main stereo outputs: low pass, low-band pass, band pass, band-high pass, high pass, and notch+bypass. Additionally, three outputs per filter are available in low pass, band pass, and high pass, which are not affected by post-saturation. The MMF-2 offers the ability to control the corner frequency (CUTOFF L and CUTOFF R) individually for each filter, while MASTER CUTOFF controls both filters. The Q-PEAK feature determines the resonance until the self-oscillation point, which can be controlled individually or by the LEFT Q-PEAK when activated by the LINK TO LEFT switch. Both CUTOFF and Q-PEAK can be manually controlled and adjusted using CV input gain.
Next on our list is the Erica Synths Drum Modulator, which features dual-syncable LFOs and a noise source. The LFOs can be used to modulate the pitch, amplitude, or filter cutoff frequency of sound signals. It features eight waveforms that are continuously faded into each other and digital noise with adjustable pitch. Furthermore, it has a high pass/low pass filter for the noise options, two outputs per channel with adjustable phase shift, sync input, rate CV input, and VCA for channel 1. Finally, there is a LINK switch that lets you synchronize both LFOs.
Our third module, the Sacrament Modular Cursible, is a morphing effects-send matrix with multiple modes of operations. It features a total of six channels and is capable of sequencing sound signals through effects chains via the clock input. Apart from that, the Cursible also has Control Voltage and Manual modes that allow the user to switch between various effects using the central knob. This module is ideal for sequencing through your sounds' effects and modulating your effects in creative ways.
Next up is the Toppobrillo Multifilter 2, the new and improved multimode filter that offers a wide range of functionalities to enhance the old filter's sound. The Multifilter 2 has two primary updates: a dual-input crossfading mixer with voltage-controlled gain and a variable mode output with continuously variable voltage-controlled response that can switch between low pass, bandpass (or notch), and high pass modes. The module can track filter frequency for some interesting effects and features a dedicated "Ping" input that percusses the filter. The Multifilter 2 is a must-have filter for inspired sound exploration.
Last but not least, we have the Erica Synths Black Low Pass VCF, a highly stable, 24dB/oct resonant low-pass VCF designed for the analogue modular purists who take sound design seriously. This module features voltage control over cutoff and resonance, gain loss compensation on high resonance, cutoff CV attenuator, and an adjustable post-filter overdrive circuit. Furthermore, it has the Black Filter Coupler connector that, along with the Black High Pass VCF and the Black Filter Coupler, forms the ultimate Holy Trinity of VCFs for any analogue modular system.
In conclusion, these advanced sound sculpting techniques using multi-mode filters and LFOs can be powerful when creating unique sounds and textures in your Eurorack systems. The Cwejman MMF-2, Erica Synths Drum Modulator, Sacrament Modular Cursible, Toppobrillo Multifilter 2 and Erica Synths Black Low Pass VCF are all excellent options for electronic music enthusiasts who want to explore advanced sound sculpting.
Example Usage
For a beginner-level usage example with the MMF-2 and Erica Synths Drum Modulator, try patching the noise output of the Drum Modulator into the CV input of the MMF-2's Q-Peak control for one of the filters. Use the filter's low pass output and adjust the cutoff and Q-Peak controls manually to shape the resulting sound. Then, use one of the LFOs on the Drum Modulator to modulate the cutoff frequency of the filter for a more dynamic effect.
An intermediate-level usage example for combining the Cwejman MMF-2 Battleship Grey filter and Erica Synths Drum Modulator LFO modules is to use the LFO to modulate the cutoff frequency of the filter. Start with a simple saw wave LFO signal patched into the MMF-2's cutoff CV input for both filters. Set both filters to the notch filter mode for a more interesting sound. Adjust the LFO's rate to create a rhythmic modulation of the filter cutoff. Try experimenting with different LFO waveforms and adjusting the LFO's phase shift on one channel of the MMF-2 to create stereo effects. If you want to take it further, you can use the Erica Synths Drum Modulator's pitched noise source to create more complex and unpredictable modulations of the filter cutoff.
Further Thoughts
To create dynamic and evolving soundscapes, try combining the Erica Synths Drum Modulator with the Cwejman MMF-2 and Toppobrillo Multifilter 2. Set the MMF-2 to true stereo mode and use CV signals to control the corner frequency and resonance of both filters. Add saturation in the pre-mode to give your sound a warm and fuzzy texture. Route the output of the MMF-2 to the Multifilter 2, utilizing the filter's voltage-controlled response to mix between the low pass, band pass, and high pass outputs. Use the Drum Modulator's two syncable LFO channels to introduce pitched noise and add rhythmic modulation to the filter parameters. Add the Erica Synths Black Low Pass VCF for even more tonal shaping with voltage control over cutoff and resonance, and adjust the post-filter overdrive circuit to add grit and distortion to your sound. Lastly, route the signal through the Cursible from Sacrament Modular, using the PIANO MODE for manual control over the sequence of effects and the FILL OPERATION to stack up to six send and return routes for even more complex sound design possibilities.