Passive Dual LPG with Linked Two-Pole Resonant Filters
The Herzlich Labs Omen is a modular synthesis marvel that delivers an impressive performance with its passive dual LPG and linked two-pole resonant filters. This Eurorack module presents a convergence of old-school LPG design and modern components, resulting in an outstanding tool that offers flexible and engaging sound-shaping capabilities.
The module features two -6dB resonant filters with custom-built vactrols, built-in CV attenuation, and three cutoff modes per filter. The first filter produces a soft and gentle low pass gate effect on the sound, while the second filter is deeper and more resonant, capable of delivering growly and distorted results when opened all the way.
One of the exciting features of the Omen is its versatility. It can operate as two discrete LPG or as one 4-pole resonant LPG, providing you with diverse options to create an array of soft and sometimes harsh tonal results. When you plug a signal into Input 1 and no signal is connected to Input 2, Output 1 produces the output signal, while Output 2 produces the signal after passing through both filters. You can adjust each filter independently to generate a wide range of sounds, from Buchla bongos to early synthesis brass and organ tones.
CV control is also well taken care of, with the option to use either one or two inputs for added versatility. When you plug in only one CV source, it will act on both channels simultaneously, a helpful function when using it in dual filter mode or when creating musically related outputs. However, using two CV inputs in dual filter mode best replicates the full potential of the module. For instance, using an envelope in CV1 and an LFO in CV2 will result in tremolo effects, commonly found with traditional LPGs.
The Omen also stands out for its custom-designed and hand-built vactrols. With minimal signal attenuation even when using the 4-pole filter settings and zero bleed-through on the LPG channels, this module delivers premium sound quality. Moreover, the vactrols offer subtle memory effects, which add to the sound's natural characteristics.
To top it off, the module sports LED lights on the front panel, simulating the vactrol action, giving users a comprehensive insight into what's happening under the hood. Overall, the Herzlich Labs Omen is a must-have for any synthesizer enthusiast looking for an impressive and versatile LPG module.
Example Usage
If you're new to using the Herzlich Labs Omen, a great place to start is to explore the different filtering modes. Experiment with the different cutoff modes on filters 1 and 2, and listen to how they affect the sound. Try using it as a dual LPG, with one signal plugged into Input 1, and no signal plugged into Input 2, to get a sense of the different tones that can be generated. Don't be afraid to play around with the CV sources as well, as they can greatly enhance the musical output of the module. And lastly, keep an eye on the LED lights on the front panel to see how the vactrols are responding to your inputs.
One creative way to use the Herzlich Labs Omen is to pair it with a sequencer and a distortion module to create aggressive and rhythmic basslines. Input a saw wave from the sequencer into Input 1 of the Omen and set Filter 2 to a low cutoff for a deep bass sound. Then, add some distortion using a module like the WMD Geiger Counter or the Erica Synths Fusion VCF3. Finally, modulate the cutoff frequencies of both filters with an LFO in CV1 to create a tremolo effect, and use CV2 to add some random modulation for a more dynamic bassline. Experiment with different combinations of filter modes and CV sources to achieve a wide range of sounds, from subtle filtering to brutal distortion.
Further Thoughts
One creative way to utilize the Herzlich Labs Omen is to use it as a programmable percussion module. Take an audio signal and route it into Input 1, then patch some CV into CV1 to serve as an envelope for controlling the amplitude of the sound. Next, patch an LFO into CV2, and adjust the cutoff frequencies of both filters to taste. The result is a percussive sound that can be shaped further by adjusting the envelope and LFO settings. With the ability to switch between two discrete LPG channels or one 4-pole resonant LPG, the Omen offers a range of creative possibilities for making unique and dynamic percussion patterns.