Bubblesound Instruments uLFO

$307.58 Price Tier: Standard

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Page last updated Jul 21, 2026

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$307.58 1 available New

$140.00 4 available Used

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Average Price: $224

Standard/Professional

$149

$350+

Price Tier

In the Modular Synthesizers category, Bubblesound Instruments uLFO is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Description

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If you're diving into the world of modular synthesis, the Bubblesound Instruments uLFO is a cornerstone module that can bring your sonic explorations to life. This low-frequency oscillator is celebrated for its versatility, offering a wide range of modulation possibilities that cater to both beginners and seasoned synth enthusiasts. The uLFO excels in producing everything from classic LFO waveforms to complex modulations, thanks to its unique phase modulation capabilities.

With a focus on precision and control, the uLFO provides a frequency range that extends well into the audio spectrum, making it an ideal candidate for both modulation tasks and as an audio source. Its high-resolution frequency control allows for fine-tuning that can be the difference between a good sound and a great one. The module is equipped with simultaneous outputs for sine, triangle, saw, ramp, square, and pulse waveforms, giving you an extensive palette to shape your sound. Whether you're looking to create evolving textures, rhythmic modulations, or drone-like soundscapes, the uLFO is a reliable and powerful module in your rack.

Key Features:

Unique phase modulation capabilities
High-resolution frequency control
Wide frequency range, extending into the audio spectrum
Simultaneous outputs for multiple waveforms: sine, triangle, saw, ramp, square, and pulse
Flexible modulation options for both LFO and audio applications
Ideal for creating complex modulations and sound textures

Product specs

Brand	Bubblesound
Model	ULFO
Finish	Silver
Year	2010s
Categories	Eurorack Modules and Cases, Synth Modules
Horizontal Pitch	14HP
Modular Synth Format	Eurorack
Polyphony	1 Voice
Synth Module Function	LFO, Oscillator

FAQs

What is the primary function of the Bubblesound Instruments uLFO in a modular synth setup?: The Bubblesound Instruments uLFO functions as both a low-frequency oscillator (LFO) and an audio-rate oscillator, making it versatile for modulating other modules or generating sound within a Eurorack setup.
What is the horizontal pitch size of the Bubblesound Instruments uLFO?: The Bubblesound Instruments uLFO occupies 14HP in a Eurorack modular synthesizer system, which is important to consider when planning your rack space.
Is the Bubblesound Instruments uLFO suitable for polyphonic synthesis?: No, the Bubblesound Instruments uLFO is designed for monophonic use, offering 1 voice, typical for modulation and sound generation in modular systems.
Can the Bubblesound Instruments uLFO be used as an audio-rate oscillator?: Yes, the uLFO can operate at audio rates, allowing it to function as an oscillator for sound generation, in addition to its primary role as an LFO.
What modular synth format does the Bubblesound Instruments uLFO use?: The Bubblesound Instruments uLFO is designed for the Eurorack modular synth format, which is a popular and widely used standard in modular synthesis.

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Bubblesound Instruments uLFO.

Features and functionality

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The Bubblesound uLFO is praised for its uniquely shaped sine wave, which stands out among LFOs for its modulation capabilities.
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The uLFO's high range extends from 4-minute cycles (approximately 0.0042 Hz) to 3.6kHz, offering versatile modulation possibilities.
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It lacks Sample and Hold and Staircase waveforms, which may require additional modules for users needing these features.
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The uLFO supports 1V/Oct tracking over 5 to 6 octaves, making it viable for use as a VCO in modular setups.
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By applying negative voltage, the uLFO's cycle time can be extended to several octaves below 2.2 hours, offering even slower modulation possibilities.
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User experience

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Some users find the uLFO essential enough to repurchase, highlighting its value and functionality in their modular setups.
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Comparisons

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Unlike the Thorn Audio VC LFO, the uLFO does not offer as many waveform options or a Sample and Hold function.
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Use cases and applications

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With a range from 2.2 hours to 3.6kHz, the uLFO can produce very slow, evolving soundscapes, ideal for users seeking gradual modulation.
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The uLFO's ability to create extremely slow cycles allows it to be used creatively, such as triggering a patch that functions like an alarm clock over 24 hours.
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