AudioFuAudioFu Chart · October 2026
Best Interface Modules 2026
The top pick is Doepfer A-119 Ext.In External Input / Envelope Follower ($84). Expert Sleepers Super Disting EX Plus A Multi-Function Eurorack Synth… leads the high end. Ranked by the AudioFu Index from 66 models across 19 brands, prices checked every night.
Last updated: October 15, 2026
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All Interface ModulesTop 10
Full detail for the 10 highest AudioFu Index scores. Every other model is listed below.
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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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Expert Sleepers ES-8 USB Audio Interface Eurorack Synth Module
ES-8 · Expert Sleepers
26 for sale on Reverb1 finish at Thomann
The ES-8 is a seriously powerful little module, perfect for modular enthusiasts who need a reliable and flexible audio interface. It’s a game-changer for integrating sample playback and external audio sources into your patch, especially if you're already deep into software CV generation like Max/MSP or Reaktor.
Pros
- DC-coupled I/O allows for true CV control and manipulation.
- ADAT input/output expands routing and recording possibilities significantly.
- Class-compliant operation simplifies setup and eliminates driver headaches.
Cons
- Power draw is relatively high, demanding a capable PSU.
- 3.5mm mini-jack connections can feel a bit flimsy over time.
82AudioFu
Index↓ 2.0%since Aug 14 · lowest so far$570 · Aug 14$559 now$559€499 at Thomann · in stockCheck price ↗ -
Expert Sleepers Super Disting EX Plus A Multi-Function Eurorack Synth…
Disting NT · Expert Sleepers
17 for sale on Reverb1 finish at Thomann
The Disting NT is a powerhouse of a module, essentially a miniature, programmable synthesizer in Eurorack format. It's perfect for experienced modular users or sound designers who want a truly versatile and deep signal processing engine, but be prepared to dig in – it's not a beginner's module.
Pros
- Incredible algorithm depth provides limitless sound design possibilities.
- DC-coupled CV connections enable complex modulation routing and experimentation.
- MicroSD card playback offers a unique, self-contained performance tool.
Cons
- Steep learning curve; requires significant time investment to master functionality.
- 22HP footprint can be restrictive in smaller modular systems.
75AudioFu
IndexStableno change since Aug 14Aug 14$781 now$781€698 at Thomann · in stockCheck price ↗ -
The Befaco InAmp is a really handy little module for bringing in external sounds – think guitars, drum machines, or other synths – into your Eurorack system. It's perfect for those wanting a clean, simple way to interface external gear, especially if you're on a budget and need to save space. The normalization is a nice touch for straightforward routing.
Pros
- Solid build quality with robust metal chassis and tight tolerances
- Flexible dual input design excels with varied signal sources
- Normalization offers a clean, simple signal chain option
Cons
- 3.5mm jacks feel a bit flimsy compared to higher-end options
- Gain range could be wider for extremely quiet or hot signals
72AudioFu
IndexStableno change since Aug 14Aug 14$144 now$144€129 at Thomann · in stockCheck price ↗ -
Expert Sleepers FH-2 Factotum MIDI / CV Converter Eurorack Synth…
FH-2 · Expert Sleepers
12 for sale on Reverb1 finish at Thomann
The FH-2 is a seriously useful little module if you're building a modular system that needs reliable MIDI interfacing and precise voltage control. It's a fantastic solution for sequencing, generating complex rhythms, or just getting your modular talking to your computer—especially great for experimental sound design and those needing robust clocking options.
Pros
- Remarkably clean D/A conversion for Eurorack applications
- Versatile USB host functionality expands modular possibilities
- Intuitive OLED display simplifies complex parameter adjustments
Cons
- Software configuration can be initially daunting for beginners
- Limited CV input count restricts complex modulation routing
71AudioFu
IndexStableno change since Aug 14Aug 14$349 now$349€312 at Thomann · in stockCheck price ↗ -
Expert Sleepers Disting MK4 Multifunction Eurorack Synth Module
Disting mk4 · Expert Sleepers
11 for sale on Reverb1 finish at Thomann
The Disting mk4 is a powerhouse in a tiny package. It’s a fantastic choice for experimental musicians, sound designers, and anyone wanting a modular swiss army knife for complex sound manipulation and sequencing—just be prepared to invest some time learning its intricacies.
Pros
- Incredibly dense feature set for its size, a true Swiss Army knife.
- Micro SD card slot unlocks a vast library of sample possibilities.
- Dot matrix display is surprisingly readable and functional for navigation.
Cons
- 4HP footprint demands careful patching and planning in smaller racks.
- Steep learning curve due to the sheer number of algorithms available.
70AudioFu
IndexStableno change since Aug 14Aug 14$208 now$208€186 at Thomann · in stockCheck price ↗ -
Doepfer A-190-4 USB / MIDI to CV / Gate / Sync Interface
A-190-4 · Doepfer
9 for sale on Reverb1 finish at Thomann
The A-190-4 is a workhorse for anyone diving into Eurorack. It's a reliable bridge between your computer and your modular, offering straightforward MIDI-to-CV conversion and clocking. Perfect for beginners and experienced users alike who need a dependable, no-frills interface.
Pros
- Rock-solid Doepfer build quality; feels exceptionally durable.
- Clear, easily readable LED display for precise parameter adjustments.
- Comprehensive MIDI implementation; handles multiple MIDI channels effectively.
Cons
- Limited resolution on CV outputs; not ideal for ultra-fine control.
- Power consumption is relatively high for a simple interface module.
68AudioFu
IndexStableno change since Aug 14Aug 14$207 now$207€185 at Thomann · in stockCheck price ↗ -
Doepfer A-190-3 USB / MIDI CV / Gate Interface
A-190-3 · Doepfer
4 for sale on Reverb2 finishes at Thomann
The A-190-3 is a solid, no-frills MIDI-CV interface for Doepfer and Eurorack systems. It's perfect for those wanting straightforward integration without complex routing or advanced modulation capabilities – a great entry point into modular MIDI control. It's a workhorse for getting your modular synths playing along with your computer or other MIDI gear.
Pros
- Robust Doepfer build quality ensures long-term reliability.
- Provides essential MIDI-to-CV conversion for modular integration.
- Four CV outputs offer flexibility for multiple modules.
Cons
- Limited resolution compared to more modern MIDI-CV interfaces.
- No velocity or aftertouch support – purely note and gate.
67AudioFu
IndexStableno change since Aug 14Aug 14$140 now$140€125 at Thomann · in stockCheck price ↗ -
Expert Sleepers ES-9 USB Interface Eurorack Synth Module
ES-9 · Expert Sleepers
8 for sale on Reverb1 finish at Thomann
The ES-9 is a serious workhorse for modular synth enthusiasts. Its rock-solid USB connectivity and DC-coupled signals make it ideal for complex patching and live performance – if you're running a serious modular rig and need reliable, low-latency audio, this is a must-have.
Pros
- Rock-solid USB performance, crucial for live modular patching.
- DC-coupled audio/CV signals unlock advanced modulation possibilities.
- Flexible I/O configuration handles complex routing scenarios.
Cons
- Requires optional MIDI breakout for full MIDI functionality.
- Limited operating system support might exclude some users.
66AudioFu
IndexStableno change since Aug 14Aug 14$692 now$692€618 at Thomann · in stockCheck price ↗ -
The 4ms Meta Module is a brilliant bridge between the physical and digital worlds of modular synthesis. It’s a fantastic entry point for those wanting to explore a vast library of virtual modules without a huge investment, and a powerful expansion tool for experienced users looking to augment their existing hardware. If you're already in the VCV Rack ecosystem, or are curious about it, this is a game-changer.
Pros
- Seamless VCV Rack integration expands sonic possibilities significantly.
- Rotary controls offer surprisingly nuanced parameter tweaking.
- Pre-installed module library provides immediate creative exploration.
Cons
- Reliance on software means no purely analog standalone operation.
- Limited RAM might restrict very large, complex patch deployments.
66AudioFu
IndexStableno change since Aug 14Aug 14$704 now$704€629 at Thomann · in stockCheck price ↗
All 66 interface modules
Same index, same nightly prices — compact. Colour options of one model share a row. Tap a photo to zoom.
- 11
Make Noise XOH ModuleXOH · Make Noise65Stable$144€129$144€129Check ↗
- 12
Expert Sleepers Little Mikey Preamp Eurorack Synth ModuleLittle Mikey · Expert Sleepers62Stable$189€169$189€169Check ↗
- 13
Joranalogue Audio Design Receive 2Joranalogue Audio Design60Stable$210€188$210€188Check ↗
- 14
Joranalogue Audio Design Transmit 2Joranalogue Audio Design60Stable$218€195$218€195Check ↗
- 15
Doepfer A-190-5 Polyphonic USB / MIDI to CV / Gate InterfaceA-190-5 · Doepfer58Stable$335€299$335€299Check ↗
- 16
Expert Sleepers ES-6 MK3 CV / Lightpipe Interface Eurorack Synth…ES-6 mk3 · Expert Sleepers57↓ 5.9%$178€159$178€159Check ↗
- 17
Befaco CV Thing Eurorack Synthesizer ModuleCV Thing · Befaco57Stable$279€249$279€249Check ↗
- 18
Xaoc Devices Sewastopol II Audio Port & Voltage ExpanderSewastopol II · XAOC Devices56Stable$290€259$290€259Check ↗
- 19
Doepfer A-190-8 USB / MIDI Sync InterfaceA-190-8 · Doepfer55Stable$140€125$140€125Check ↗
- 20
Frap Tools CGM Creative Mixer Series - M one MasteroneCGM Masterone · Frap Tools55Stable$353€315$353€315Check ↗
- 21
Befaco Out 1U Eurorack Synthesizer Module1U Out · Befaco54Stable$100€89$100€89Check ↗
- 22
Behringer Cu1ABehringer53↓ 44.7%$53€47$53€47Check ↗
- 23
Intellijel Designs Pedal I/O JACKS 1UIntellijel Designs50Stable$27€24$27€24Check ↗
- 24
Intellijel Designs Line Out 1UIntellijel Designs50Stable$44€39$44€39Check ↗
- 25
Intellijel Designs Stereo Line In 1UIntellijel Designs50Stable$83€74$83€74Check ↗
- 26
Intellijel Designs Stereo Out 1UIntellijel Designs50Stable$87€78$87€78Check ↗
- 27
Intellijel Designs Headphones 1UIntellijel Designs50Stable$87€78$87€78Check ↗
- 28
Intellijel Designs Pedal I/O 1U V2Intellijel Designs50Stable$115€103$115€103Check ↗
- 29
Intellijel Designs OutsIntellijel Designs50Stable$188€168$188€168Check ↗
- 30
Intellijel Designs StompIntellijel Designs50Stable$234€209$234€209Check ↗
- 31
Intellijel Designs Stereo I/O 1UIntellijel Designs50Stable$241€215$241€215Check ↗
- 32
Intellijel Designs MIDI 1UIntellijel Designs50Stable$255€228$255€228Check ↗
- 33
BASTL Instruments 1983 Polyphonic MIDI to CV Interface1983 · Bastl Instruments50Stable$256€229$256€229Check ↗
- 34
Intellijel Designs uMIDIIntellijel Designs50Stable$274€245$274€245Check ↗
- 35
Intellijel Designs Audio I/O (2023)Intellijel Designs50Stable$312€279$312€279Check ↗
- 36
Doepfer A-139-2 Headphone AmplifierDoepfer49Stable$66€59$66€59Check ↗
- 37
Doepfer A-190-7 1UDoepfer49Stable$72€64$72€64Check ↗
- 38
Doepfer A-119-2Doepfer49Stable$73€65$73€65Check ↗
- 39
Doepfer A-192-2Doepfer49Stable$144€129$144€129Check ↗
- 40
Befaco MIDI Thing V2 Eurorack Synthesizer ModuleMIDI Thing V2 · Befaco49Stable$357€319$357€319Check ↗
- 41
Befaco 1U STAmpBefaco48Stable$88€79$88€79Check ↗
- 42
Befaco Output V3Befaco48Stable$161€144$161€144Check ↗
- 43
Expert Sleepers NTX-8CVExpert Sleepers48Stable$223€199$223€199Check ↗
- 44
Befaco I4 Instrument InterfaceBefaco48Stable$263€235$263€235Check ↗
- 45
Befaco VCMCBefaco48Stable$373€333$373€333Check ↗
- 46
Expert Sleepers ES-10Expert Sleepers48Stable$402€359$402€359Check ↗
- 47
Behringer CM1A MIDI to CV Eurorack ModuleCM1A · Behringer47↓ 2.5%$44€39$44€39Check ↗
- 48
ADDAC 309 CV to ExpressionADDAC46Stable$84€75$84€75Check ↗
- 49
4ms Percussion Interface + Exp.4ms46↓ 3.6%$178€159$178€159Check ↗
- 50
Vermona Modular qMI2 - quad Midi interfaceVermona Modular45↓ 0.8%$409€365$409€365Check ↗
- 51
Vermona Modular Twin OutVermona Modular44Stable$290€259$290€259Check ↗
- 52
Vermona Modular TAI-4Vermona Modular44Stable$412€368$412€368Check ↗
- 53
NANO Modules ST-OUTNANO Modules43Stable$151€135$151€135Check ↗
- 54
NANO Modules ST-INNANO Modules43Stable$151€135$151€135Check ↗
- 55
ADDAC 710 Balanced OutputsADDAC43↑ 5.7%$207€185$207€185Check ↗
- 56
XAOC Devices Drezno IIXAOC Devices43Stable$308€275$308€275Check ↗
- 57
Behringer Perfect Pitch PP1 Eurorack ModulePerfect Pitch PP1 · Behringer42↓ 3.9%$83€74$83€74Check ↗
- 58
vpme.de trig31vpme.de42↓ 2.9%$151€135$151€135Check ↗
- 59
Strymon AA1 Level ShifterStrymon42↓ 2.1%$154€138$154€138Check ↗
- 60
Erica Synths Pico OutputErica Synths41Stable$106€95$106€95Check ↗
- 61
ADDAC 200PI Pedal IntegratorADDAC41↑ 9.5%$129€115$129€115Check ↗
- 62
Hexinverter Électronique Mutant BrainHexinverter Électronique41Stable$233€208$233€208Check ↗
- 63
ADDAC 220 Dual Envelope Follower+ADDAC41↑ 10.2%$413€369$413€369Check ↗
- 64
4ms Listen IO4ms40↑ 7.8%$156€139$156€139Check ↗
- 65
ADDAC 711 Balanced InputsADDAC40↑ 12.0%$312€279$312€279Check ↗
- 66
Rides In The Storm CONRides In The Storm36↑ 10.2%$73€65$73€65Check ↗
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
Gain Staging
This is everything. A poorly designed interface module can introduce noise or clip your signal before it even leaves your case. Look for modules with clear gain controls and a decent headroom buffer - you don't want to be fighting noise on stage or constantly adjusting levels in your DAW.
Input/Output Impedance
Matching impedances is vital for clean signal transfer. A low-impedance output into a high-impedance input will load down your oscillators, robbing them of sustain and dynamics. Check the specs and, if possible, test with your existing gear to ensure a transparent signal path.
Connectivity
Beyond the obvious ¼" jacks, consider what other options you need - S/PDIF, ADAT, USB. Do you need multiple outputs for routing to different effects chains or monitors? Think about your workflow and future needs.
Latency
Especially important if you're recording, latency is the delay between your signal and what you hear back. Some modules, particularly older or cheaper ones, can introduce noticeable lag. Look for modules with minimal processing and well-optimized drivers.
Build Quality & Noise Floor
Let's be honest, modular synths are an investment. A flimsy module with a noisy preamp will degrade your signal and frustrate you. Solid construction and a low noise floor are non-negotiable - you'll hear the difference in a quiet mix.
Buying guide
So, you're diving into the modular world? Awesome. But slapping a bunch of oscillators and filters together is only half the battle - you need a solid interface module to actually get that sound out and into your DAW, your mixer, or a PA system. These modules are the crucial link between your sonic playground and the outside world, and choosing the right one can make or break your workflow. Let's break down what to look for.
Don't cheap out on the interface - it's the last thing you want to be a weak link. Budget modules often cut corners on components, leading to higher noise floors and questionable gain staging. While you don't need to drop a fortune, prioritize modules from reputable manufacturers with a track record of clean signal paths and reliable performance.
A few extra bucks here is an investment in your sanity and the quality of your sound.
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 simple audio interface module and a more complex one?
Simple modules primarily convert analog signals to digital or vice versa. Complex ones might offer routing capabilities, multiple input/output options, or even built-in effects - they're essentially mini-mixers/routers in module format.
My module is introducing a high-pitched whine. What's going on?
That's usually ground loop hum or a noisy preamp. Double-check your grounding, try different power outlets, and if it persists, the module might be faulty.
Can I use any old audio interface module with my modular system?
Technically, yes, but impedance mismatch can severely impact your sound. Research the input and output impedances of both your modular gear and the interface module to ensure compatibility.
USB connectivity is a must-have? Is it worth the extra cost?
If you plan on recording or integrating your modular system with a DAW, USB is a huge convenience. However, USB interfaces can sometimes introduce slightly higher latency than dedicated audio outputs - it's a trade-off.
What's 'headroom' and why should I care?
Headroom is the amount of signal you can push before clipping. More headroom means more dynamic range and less risk of distortion, especially when dealing with hot oscillator signals. A module with good headroom will give you a cleaner, more professional sound.
