AudioFuAudioFu Chart · October 2026
Best Interface Modules for Beginner 2026
The top pick is Intellijel Designs Pedal I/O JACKS 1U ($27). Intellijel Designs Stereo Out 1U leads the high end. Ranked by the AudioFu Index from 66 models across 19 brands, prices checked every night.
Last updated: October 15, 2026
Top 10
Full detail for the 10 highest AudioFu Index scores. Every other model is listed below.
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This little box is a lifesaver for anyone running pedals into their modular system with an Intellijel I/O. It’s the missing link that lets you easily route signals, and at 8HP, it's incredibly efficient. If you're trying to squeeze every last patch point out of your rack, this is a must-have accessory.
Pros
- Extremely compact 1U form factor maximizes patch bay density
- Provides essential pedal interfacing without significant HP consumption
- Robust Intellijel build quality ensures long-term reliability
Cons
- Requires the Intellijel I/O 1U base module, adding to overall cost
- Limited to basic TS jack connectivity; lacks advanced features
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Doepfer A-119 Ext.In External Input / Envelope Follower
A-119 · Doepfer
14 for sale on Reverb2 finishes at Thomann
The A-119 is a workhorse module for integrating external sounds into your modular system. It’s fantastic for triggering events based on external audio, or shaping those sounds with its envelope follower. Ideal for experimental musicians and sound designers who want a flexible and affordable interface.
Pros
- Excellent pre-amp gain range for both line and mic signals
- Envelope follower accurately tracks complex audio dynamics
- Balanced input handles low-level signals with impressive clarity
Cons
- Limited routing options compared to more advanced envelope processors
- Gain staging can be tricky, requiring careful adjustment
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This little box is a lifesaver for Eurorack users needing a clean, balanced output. It's perfect for patching into external mixers or interfaces where you need a professional signal level, and the small size means it won’t hog valuable HP. If you're tired of noisy or unbalanced connections, this is a no-brainer.
Pros
- Excellent balanced output for pristine signal transfer
- Extremely compact 1U form factor maximizes rack space
- Robust Intellijel build quality ensures long-term reliability
Cons
- Limited to a single output path - no flexibility
- No gain adjustment; relies on preceding modules
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The Cu1A is a surprisingly capable little module for anyone dipping their toes into Eurorack recording or needing a simple, portable interface. It's ideal for experimentalists, budget-conscious builders, or those who just need to capture audio from their modular setup without breaking the bank. Don't expect audiophile-grade performance, but it gets the job done remarkably well.
Pros
- Excellent value for a USB audio interface in Eurorack format.
- USB-C class compliance simplifies setup across various operating systems.
- Headphone output provides convenient monitoring with adjustable volume.
Cons
- 3.5mm jacks feel somewhat flimsy and may be prone to wear with heavy use.
- Limited input/output options restrict more complex routing scenarios.
53AudioFu
Index↓ 44.7%since Aug 14 · lowest so far$95 · Aug 14$53 now$53€47 at Thomann · in stockCheck price ↗ -
The CM1A is a surprisingly capable little module for the price. It's perfect for modular newcomers or anyone wanting to sequence their synths from a computer or MIDI controller without a huge investment. Don't expect premium feel, but the conversion accuracy is solid for basic sequencing and modulation.
Pros
- Excellent value for a 16-bit MIDI-to-CV conversion.
- Dual CV/Gate outputs offer flexibility for complex modulation.
- Compact 6HP footprint saves precious space in a modular setup.
Cons
- Build quality feels plasticky and less robust than higher-end modules.
- Monophonic/Duophonic limitation restricts polyphonic sequencing capabilities.
47AudioFu
Index↓ 2.5%since Aug 14 · lowest so far$45 · Aug 14$44 now$44€39 at Thomann · in stockCheck price ↗ -
The A-139-2 is a no-nonsense headphone amp for your modular setup. It's a fantastic, affordable solution for monitoring multiple audio sources simultaneously – perfect for those patching complex soundscapes and needing a reliable, clean signal without fuss. The normalization feature is a real time-saver for quick comparisons.
Pros
- Solid Doepfer build quality; feels robust and reliable
- Normalization simplifies layering sounds from two sources
- Provides ample power for most headphones, even high-impedance models
Cons
- Shared volume control can be inconvenient for independent level adjustments
- 6.3mm jack is standard but can feel a bit dated
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This small module turns your MIDI keyboard into a controller for your Eurorack setup. It sends commands as voltage and gate signals but only works with one note at a time. It fits perfectly in a case and connects easily with standard cables.
Pros
- Converts monophonic MIDI commands directly to CV and gate signals
- Supports both TRS MIDI type A and type B cable standards
- Includes parallel CV outputs and gate outputs for flexible routing
Cons
- Limited to monophonic voice only, no polyphonic capability
- Lacks physical knobs or buttons for manual parameter adjustment
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The A-119-2 is a no-frills, reliable dual amplifier perfect for anyone building a Eurorack system who needs basic signal boosting and routing. It's a great starting point for learning gain staging and stereo patching, especially if space is at a premium. It's an excellent value for what it offers.
Pros
- Solid Doepfer build quality; feels robust and dependable in a modular system.
- 45dB gain per channel provides significant signal boosting and shaping capabilities.
- Normalization feature simplifies stereo signal routing within your modular patch.
Cons
- Limited functionality compared to more complex mixing or utility modules.
- Overload LEDs are basic; lack nuance for precise gain staging.
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This little Intellijel is a seriously clean and convenient way to get stereo signals into your modular system. It's a great choice for anyone using Intellijel’s Palette or 7U cases, or building a custom panel – the balanced inputs and mono normalisation really expand your routing options.
Pros
- Excellent balanced input for pristine stereo signals
- Compact 1U form factor ideal for space-constrained systems
- Normalisation to mono simplifies signal routing and flexibility
Cons
- Limited to Intellijel cases or specific panels, restricting placement
- Relatively high power draw for a simple input module
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The Stereo Out 1U is a no-nonsense output module from Intellijel. It’s perfectly suited for those already invested in their ecosystem, especially those with limited space, needing a clean, reliable stereo signal without extra frills. This is a solid choice for serious modular users wanting a straightforward solution.
Pros
- Excellent +4dBu output level, ideal for high-end modular systems
- Compact 8 TE width maximizes precious Eurorack space
- Solid Intellijel build quality; feels robust and dependable
Cons
- Limited compatibility; requires specific Intellijel cases or modules
- Signal LEDs provide basic indication; no detailed metering
All 66 interface modules
Same index, same nightly prices — compact. Colour options of one model share a row. Tap a photo to zoom.
- 11
Intellijel Designs Headphones 1UIntellijel Designs50Stable$87€78$87€78Check ↗
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ADDAC 309 CV to ExpressionADDAC46Stable$84€75$84€75Check ↗
- 13
Befaco 1U STAmpBefaco48Stable$88€79$88€79Check ↗
- 14
Befaco Out 1U Eurorack Synthesizer Module1U Out · Befaco54Stable$100€89$100€89Check ↗
- 15
Behringer Perfect Pitch PP1 Eurorack ModulePerfect Pitch PP1 · Behringer42↓ 3.9%$83€74$83€74Check ↗
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Rides In The Storm CONRides In The Storm36↑ 10.2%$73€65$73€65Check ↗
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Erica Synths Pico OutputErica Synths41Stable$106€95$106€95Check ↗
- 18
Expert Sleepers ES-8 USB Audio Interface Eurorack Synth ModuleES-8 · Expert Sleepers82↓ 2.0%$559€499$559€499Check ↗
- 19
Expert Sleepers Super Disting EX Plus A Multi-Function Eurorack Synth…Disting NT · Expert Sleepers75Stable$781€698$781€698Check ↗
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Befaco InAmp Eurorack Synthesizer ModuleInAmp · Befaco72Stable$144€129$144€129Check ↗
- 21
Expert Sleepers FH-2 Factotum MIDI / CV Converter Eurorack Synth…FH-2 · Expert Sleepers71Stable$349€312$349€312Check ↗
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Expert Sleepers Disting MK4 Multifunction Eurorack Synth ModuleDisting mk4 · Expert Sleepers70Stable$208€186$208€186Check ↗
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Doepfer A-190-4 USB / MIDI to CV / Gate / Sync InterfaceA-190-4 · Doepfer68Stable$207€185$207€185Check ↗
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Doepfer A-190-3 USB / MIDI CV / Gate InterfaceA-190-3 · Doepfer · 2 finishes67Stable$140€125$140€125Check ↗
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Expert Sleepers ES-9 USB Interface Eurorack Synth ModuleES-9 · Expert Sleepers66Stable$692€618$692€618Check ↗
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4MS Meta ModuleMeta Module · 4ms66Stable$704€629$704€629Check ↗
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Make Noise XOH ModuleXOH · Make Noise65Stable$144€129$144€129Check ↗
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Expert Sleepers Little Mikey Preamp Eurorack Synth ModuleLittle Mikey · Expert Sleepers62Stable$189€169$189€169Check ↗
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Joranalogue Audio Design Receive 2Joranalogue Audio Design60Stable$210€188$210€188Check ↗
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Joranalogue Audio Design Transmit 2Joranalogue Audio Design60Stable$218€195$218€195Check ↗
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Doepfer A-190-5 Polyphonic USB / MIDI to CV / Gate InterfaceA-190-5 · Doepfer58Stable$335€299$335€299Check ↗
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Expert Sleepers ES-6 MK3 CV / Lightpipe Interface Eurorack Synth…ES-6 mk3 · Expert Sleepers57↓ 5.9%$178€159$178€159Check ↗
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Befaco CV Thing Eurorack Synthesizer ModuleCV Thing · Befaco57Stable$279€249$279€249Check ↗
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Xaoc Devices Sewastopol II Audio Port & Voltage ExpanderSewastopol II · XAOC Devices56Stable$290€259$290€259Check ↗
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Doepfer A-190-8 USB / MIDI Sync InterfaceA-190-8 · Doepfer55Stable$140€125$140€125Check ↗
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Frap Tools CGM Creative Mixer Series - M one MasteroneCGM Masterone · Frap Tools55Stable$353€315$353€315Check ↗
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Intellijel Designs Pedal I/O 1U V2Intellijel Designs50Stable$115€103$115€103Check ↗
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Intellijel Designs OutsIntellijel Designs50Stable$188€168$188€168Check ↗
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Intellijel Designs StompIntellijel Designs50Stable$234€209$234€209Check ↗
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Intellijel Designs Stereo I/O 1UIntellijel Designs50Stable$241€215$241€215Check ↗
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Intellijel Designs MIDI 1UIntellijel Designs50Stable$255€228$255€228Check ↗
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BASTL Instruments 1983 Polyphonic MIDI to CV Interface1983 · Bastl Instruments50Stable$256€229$256€229Check ↗
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Intellijel Designs uMIDIIntellijel Designs50Stable$274€245$274€245Check ↗
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Intellijel Designs Audio I/O (2023)Intellijel Designs50Stable$312€279$312€279Check ↗
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Doepfer A-192-2Doepfer49Stable$144€129$144€129Check ↗
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Befaco MIDI Thing V2 Eurorack Synthesizer ModuleMIDI Thing V2 · Befaco49Stable$357€319$357€319Check ↗
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Befaco Output V3Befaco48Stable$161€144$161€144Check ↗
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Expert Sleepers NTX-8CVExpert Sleepers48Stable$223€199$223€199Check ↗
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Befaco I4 Instrument InterfaceBefaco48Stable$263€235$263€235Check ↗
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Befaco VCMCBefaco48Stable$373€333$373€333Check ↗
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Expert Sleepers ES-10Expert Sleepers48Stable$402€359$402€359Check ↗
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4ms Percussion Interface + Exp.4ms46↓ 3.6%$178€159$178€159Check ↗
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Vermona Modular qMI2 - quad Midi interfaceVermona Modular45↓ 0.8%$409€365$409€365Check ↗
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Vermona Modular Twin OutVermona Modular44Stable$290€259$290€259Check ↗
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Vermona Modular TAI-4Vermona Modular44Stable$412€368$412€368Check ↗
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NANO Modules ST-OUTNANO Modules43Stable$151€135$151€135Check ↗
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NANO Modules ST-INNANO Modules43Stable$151€135$151€135Check ↗
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ADDAC 710 Balanced OutputsADDAC43↑ 5.7%$207€185$207€185Check ↗
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XAOC Devices Drezno IIXAOC Devices43Stable$308€275$308€275Check ↗
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vpme.de trig31vpme.de42↓ 2.9%$151€135$151€135Check ↗
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Strymon AA1 Level ShifterStrymon42↓ 2.1%$154€138$154€138Check ↗
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ADDAC 200PI Pedal IntegratorADDAC41↑ 9.5%$129€115$129€115Check ↗
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Hexinverter Électronique Mutant BrainHexinverter Électronique41Stable$233€208$233€208Check ↗
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ADDAC 220 Dual Envelope Follower+ADDAC41↑ 10.2%$413€369$413€369Check ↗
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4ms Listen IO4ms40↑ 7.8%$156€139$156€139Check ↗
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ADDAC 711 Balanced InputsADDAC40↑ 12.0%$312€279$312€279Check ↗
Interface Modules by the numbers
Measured across all 68 models we track, not a sample.
Median $188 — half of all interface modules here cost less.
How to choose the best interface modules
Playability
This isn't just about key size or action. It's about how naturally your musical ideas translate to the module. A sequencer with a clunky step-time resolution or a keyboard with a stiff feel will kill your flow.
Feature Complexity
Modular synths are already complex. Interface modules shouldn't add to that. Look for modules with a clear, logical layout and minimal, well-explained features. Overload can be paralyzing.
Learning Curve
Some modules have a steeper learning curve than others. A sequencer with tons of modulation options might seem cool, but if you're just starting out, it'll be frustrating. Start simple, build your understanding, then move on.
Modulation Capabilities
While keeping it simple initially, a little modulation goes a long way. Look for modules that offer basic CV/Gate outputs for some simple patching possibilities - even just a simple LFO modulating a filter cutoff can open up a whole new world of sound.
Build Quality & Reliability
Let's be honest, this is modular. Things can break. But a flimsy build will fail faster. Look for robust knobs, jacks, and a generally solid feel - you want something that'll survive a few gigs (and accidental bumps).
Buying guide
So, you're diving into the modular world? Awesome! But before you start patching oscillators to VCAs and dreaming of evolving textures, you need a way to actually play that thing. Interface modules - sequencers, keyboards, ribbon controllers - are your gateway. Let's break down which ones are genuinely approachable for beginners, without needing a PhD in voltage control.
Don't chase the flashy features right away. A simple, well-built sequencer or keyboard that you can actually play comfortably is far more valuable than a complex beast you'll abandon after a week. Used gear is your friend - you can often find great deals on slightly older modules that are perfectly capable.
And remember, the cheapest modules often cut corners on component quality, which can lead to drift and unreliable performance down the line.
How the AudioFu Index works
Five measured signals and nothing else — no stars from strangers, no “tested by experts” we didn’t do. The weights are fixed and public. We don’t play these instruments; we measure the market around them.
This chart covers 68 interface modules from the Thomann catalogue. Before you buy, read hands-on reviews and, where you can, play it. Full methodology.
AudioFu earns a commission when you buy through our Thomann links. It never changes the order — the index does.
- Demand40%
How many of this exact model are for sale on Reverb right now — what musicians actually buy and resell.
- Lineup20%
How many finishes Thomann stocks — makers expand the models that sell.
- Price15%
Where the price has moved since we started tracking in August.
- Specs15%
How completely the maker documents it.
- Maker10%
How deep the brand’s range is in this category.
Questions
What's the difference between a sequencer and a step sequencer?
A sequencer is a broad term. A step sequencer is a specific type that divides a pattern into discrete steps. Step sequencers are generally easier to grasp for beginners because you're manipulating individual steps.
Do I need a keyboard module if I already have a MIDI controller?
Not necessarily, but a dedicated Eurorack keyboard module will give you true analog control and often offers CV/Gate outputs that a MIDI-to-CV converter won't. The feel is also often different - a proper synth keyboard action can be much more expressive.
How much should I spend on an interface module?
Entry-level modules can be found for $50-$100, but expect to spend $150-$300 for something with decent build quality and a few useful features. Don't cheap out completely - a frustrating module won't get used.
What's 'CV/Gate' and why do I need to know about it?
CV (Control Voltage) is how modular synths communicate - it's a voltage signal that controls things like pitch and filter cutoff. Gate is a simple on/off signal that triggers events like envelopes. Interface modules use these to interact with the rest of your system.
I'm overwhelmed! Where do I even start?
Start with a simple step sequencer like the Intellijel Quadrax or a basic keyboard like the Doepfer ABJ. Focus on getting comfortable with the basics before adding more complexity. Watch some beginner tutorials - there are tons out there.
