Expert Sleepers Lorelei Analog Oscillator
Best premium analog oscillator for advanced modular synthesis.
The Expert Sleepers Lorelei is an analog VCO for Eurorack modular synthesizers, offering unique waveshaping and sound sculpting capabilities. It provides three distinct waveform outputs—square/pulse, sine/pseudo-triangle, and cosine/pseudo-saw—all influenced by the Shape waveshaping knob. The module features simultaneous sine and cosine outputs, useful for modulation, and a unique X-mod input that blends signals for rich textures, setting it apart from traditional sync inputs. With linear and exponential FM inputs, it allows for subtle coloration to complex modulation.
$189.00
Owner Satisfaction
4.6
/ 5
Category Rank
139
/ 227
#139 in Electronic Oscillators
Price vs Category Average
-91%
Below average
Width
8
/ hp
Who it's for
- Sound designers seeking a single module for diverse, rich sonic textures.
- Modular synth users optimizing rack space without compromising feature depth.
- Musicians prioritizing authentic, high-quality analog sound in their modular system.
Who should skip it
- Newcomers to modular synthesis expecting an all-in-one, ready-to-play device.
- Beginners to synthesis who prefer immediate gratification over deep sound design.
- Budget-conscious producers exploring entry-level Eurorack modules or alternatives.
Performance breakdown
Waveshaping Versatility
The Shape knob transforms basic waveforms into complex, harmonically rich textures.
Modulation Depth
Quadrature outputs and dual FM inputs offer deep, intricate modulation possibilities.
X-Mod Texture
Unique signal blending creates timbres far beyond standard oscillator sync capabilities.
Eurorack Integration
Compact 8hp footprint fits easily into even the most crowded racks.
Sonic Character
Discrete transistor OTAs deliver a warm, authentic analog sound profile.
Patching Flexibility
Simultaneous outputs provide excellent utility for complex, evolving modular patches.
Key Specs
Width
8hp
Depth
42mm
Current draw
55mA @ +12V
Current draw
54mA @ -12V
Mounting Type
Eurorack module
Features
- Unique waveshaping and sound sculpting
- Three simultaneous waveform outputs
- Quadrature sine outputs for modulation
- Unique X-mod signal blending
- Linear and exponential FM inputs
- Discrete transistor OTAs
What customers say
Customers consistently highlight the Lorelei's exceptional sound quality, describing it as rich, full, and capable of a wide sonic palette. Many appreciate its unique design and versatile modulation options, making it a powerful tool for creative sound design. Users find it intuitive despite its depth, praising its robust build and reliable performance in modular setups. The overall consensus points to a highly regarded oscillator that delivers premium analog character and extensive sonic exploration.
Know before you buy
Unlike a traditional hard sync input that resets the oscillator's phase, the X-mod input blends external signals into the waveshaping circuit. This creates complex, evolving textures and harmonic interactions rather than the aggressive, sharp resets typically associated with sync.
Yes, the module provides simultaneous sine and cosine outputs, which are perfect for quadrature modulation. These outputs are phase-shifted by 90 degrees, making them ideal for complex panning, stereo effects, or driving other modules that require quadrature signals.
The Lorelei uses discrete transistor OTAs, which provide a warm, organic analog character. Its unique waveshaping capabilities allow you to move from clean, classic tones to more complex, sculpted timbres that feel distinct from standard saw or square wave oscillators.
Yes, it includes dedicated inputs for both. Exponential FM is great for classic, dramatic pitch sweeps and vibrato, while linear FM allows for more subtle, clean harmonic coloration and complex metallic timbres.
The Lorelei has a depth of 42mm. It should fit comfortably in most standard Eurorack cases, but you should verify your specific case depth if you are using a very shallow skiff.
The module draws 55mA from the +12V rail and 54mA from the -12V rail. It is relatively power-efficient, but always ensure your power supply has enough headroom for your entire system before adding new modules.
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$189