Doepfer A-121-3 VCF

$95.00 to $127.00 Price Tier: Budget

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Page last updated Jul 04, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated May 27, 2026.

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5.0 (1)

$127.00

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4.6 (13)

$95.00

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Average Price: $111

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-121-3 VCF is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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Price History

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Description

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Meet the Doepfer A-121-3 VCF, a compact yet powerful addition to your Eurorack modular synthesizer setup. This ultra-slim 4HP module is designed to bring versatility and depth to your sound design, offering four simultaneous filter outputs: lowpass, highpass, bandpass, and notch. Whether you're crafting lush pads or sharp leads, the A-121-3 provides a range of tonal possibilities with its smooth 12dB per octave filter slope.

The A-121-3 is equipped with intuitive controls for filter frequency, modulation depth, resonance, and input level, ensuring you can fine-tune your sounds with precision. Its two CV inputs allow for dynamic modulation of the filter cutoff, while an additional CV input manages resonance, enabling expressive and creative frequency manipulation. Compact doesn't mean compromised; the Doepfer A-121-3 is a testament to how innovative design can coexist with a minimal footprint.

Ideal for both seasoned synth enthusiasts and those new to modular synthesis, this module is a perfect fit for any cramped Eurorack setup. Its low current consumption also makes it a practical choice for diverse systems. Dive into the world of modular synthesis with confidence, knowing the A-121-3 is built to deliver exceptional sound quality and flexibility.

Key Features:

12 dB multimode voltage-controlled filter (VCF)
Simultaneous outputs: lowpass, highpass, bandpass, and notch
Controls for filter frequency, modulation depth, resonance, and input level
2 CV inputs for filter frequency modulation, 1 CV input for resonance
Compact 4HP width, ideal for space-conscious setups
Low current consumption: 40 mA (+12 V) / 30 mA (-12 V)

Product specs

Available since	June 2019
Width	4 TE / HP

FAQs

What type of filter is the Doepfer A-121-3 VCF?: The Doepfer A-121-3 is a 12dB multimode filter Eurorack module, offering low-pass, high-pass, band-pass, and notch filter modes.
How wide is the Doepfer A-121-3 module in a Eurorack setup?: The Doepfer A-121-3 module has a width of 4 HP, making it a compact addition to any Eurorack setup.
What is the primary function of the Doepfer A-121-3 VCF in a modular synthesizer system?: The Doepfer A-121-3 VCF is used to shape the frequency content of audio signals, allowing users to sculpt sound by filtering out specific frequencies.
Is the Doepfer A-121-3 suitable for beginners in modular synthesis?: Yes, the Doepfer A-121-3 is suitable for beginners due to its straightforward design and essential filtering capabilities, which are fundamental to sound shaping in modular synthesis.

Videos

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Maelogue

Doepfer A-121-3 Simple Sound Demo (Saw and Square waves)

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Reviews

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PROS

Compact size saves space in setups
Multiple modulation inputs enhance sound manipulation
Well-built and durable construction
Offers many sound shaping options
Provides precise control over resonance and cutoff
Delivers high-quality sound, even at high resonance
Excellent value for the price

CONS

Sound may not be super exciting to all users
Some may find it a bit difficult to use due to its size

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-121-3 VCF.

Features and functionality

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The A-121-3 filter is noted for its compact size and straightforward knob design but is criticized for lack of responsiveness and minimal filtering effect.
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The Doepfer Wasp filter is praised for its nonlinear behavior when resonance is increased, offering unique and eccentric character.
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The WMD C4RBN filter, although 4hp, offers wavefolding and CV-able saturation, providing distortion and warmth, making it an interesting alternative to 8hp options.
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The Void Modular Sirius’ Veil is recommended as a stereo filter option, particularly suited for the 4ms Ensemble Oscillator, and is noted for its price and HP efficiency.
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Build quality

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Users mention knobs on some Doepfer modules can feel gummy, and several interesting features are accessible only via jumper pins on the back.
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Comparisons

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The Noise Reap 2164 filter is preferred by some owners over the A-121-3 for its responsiveness, highlighting the Doepfer filter's limitations.
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The MI Ripples filter is described as sounding "rolandy," implying a smooth, classic Roland filter sound that users appreciate for its neutrality.
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The Forbidden Planet filter is likened to the filter in the Minibrute, suggesting a similar tonal character for those familiar with that sound.
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Use cases and applications

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Doepfer modules are praised for their role as foundational tools in modular setups, allowing for quick patching and freeing mental space for complex modules.
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The Qu-Bit Prism is highlighted for its stereo capabilities and additional features like delay and bit crushing, suitable for glitchy and ambient music.
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Value and pricing

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The Doepfer A-130-8 VCA is highlighted for its affordability, costing around $100-$120 for eight VCAs, representing excellent value per channel.
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User experience

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Owners appreciate Doepfer's straightforward, single-function module design, which reduces the need for manual consultation and simplifies large modular systems.
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