AudioFuAudioFu Chart · October 2026
Best Interface Modules for Advanced 2026
The top pick is Expert Sleepers ES-8 USB Audio Interface Eurorack Synth Module ($559). Expert Sleepers FH-2 Factotum MIDI / CV Converter Eurorack Synth… gives you the most for the money at $349. 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
Top 10
Full detail for the 10 highest AudioFu Index scores. Every other model is listed below.
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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 ↗ -
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 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 ↗ -
Frap Tools CGM Creative Mixer Series - M one Masterone
CGM Masterone · Frap Tools
6 for sale on Reverb1 finish at Thomann
The Masterone is a seriously useful piece for anyone deep in the Frap Tools CGM ecosystem. It’s rock-solid build quality and clean monitoring section make it a crucial hub for managing complex mixes, especially when you're dealing with multiple CGM groups. If you're already invested in the system, this is a no-brainer for polish and control.
Pros
- Robust XLR outputs offer pristine, balanced signal transmission.
- Excellent headphone amp delivers clean, powerful monitoring.
- Compact 12TE width maximizes space in dense modular racks.
Cons
- Requires the CGM Creative Mixer system; not standalone functionality.
- Power draw, while moderate, can add up in large systems.
55AudioFu
IndexStableno change since Aug 14Aug 14$353 now$353€315 at Thomann · in stockCheck price ↗ -
Doepfer A-190-5 Polyphonic USB / MIDI to CV / Gate Interface
A-190-5 · Doepfer
4 for sale on Reverb1 finish at Thomann
The Doepfer A-190-5 is a solid workhorse for modular users wanting MIDI control over multiple voices. It’s a great solution for sequencing complex polyphonic patterns or integrating external MIDI gear—particularly for those wanting to expand the capabilities of their existing analog voice modules without committing to a full-blown poly synth.
Pros
- Robust German engineering ensures long-term reliability and stability
- Flexible voice addressing allows for nuanced polyphonic sequencing
- Assignable CV outputs expand modulation possibilities beyond basic pitch/gate
Cons
- Limited polyphony compared to dedicated poly synths restricts complexity
- Menu navigation can feel a little clunky without dedicated encoders
58AudioFu
IndexStableno change since Aug 14Aug 14$335 now$335€299 at Thomann · in stockCheck price ↗ -
Befaco MIDI Thing V2 Eurorack Synthesizer Module
MIDI Thing V2 · Befaco
2 for sale on Reverb1 finish at Thomann
The MIDI Thing V2 is a powerhouse for serious modular users. Its 12 outputs and flexible routing options unlock incredibly complex control possibilities, and the web editor makes tweaking a breeze. It’s perfect for those who need to translate intricate MIDI data into nuanced modulation for their Eurorack systems.
Pros
- 12 outputs offer unparalleled routing flexibility for complex modular setups.
- Web editor simplifies configuration, eliminating frustrating menu diving.
- Robust OLED display provides clear, at-a-glance parameter information.
Cons
- The included expander cable feels a bit flimsy for frequent use.
- Configuration can be overwhelming for beginners without modular experience.
49AudioFu
IndexStableno change since Aug 14Aug 14$357 now$357€319 at Thomann · in stockCheck price ↗ -
The Befaco VCMC is a seriously powerful and flexible MIDI interface for your modular system. It's a dream for performers who want hands-on control over multiple synth voices or effects simultaneously, and the recall functions are a huge time-saver. If you’re building a performance-focused modular rig, this is a vital piece.
Pros
- Eight faders offer precise, nuanced control over multiple parameters
- Button assignments provide tactile, immediate modulation options
- Excellent recall functionality preserves complex performance setups
Cons
- 20HP width can be restrictive in smaller Eurorack cases
- Limited display makes parameter tweaking somewhat less intuitive
48AudioFu
IndexStableno change since Aug 14Aug 14$373 now$373€333 at Thomann · in stockCheck price ↗ -
The ES-10 is a game-changer for modular users needing to bridge digital ADAT devices to the analog world. It’s incredibly clean sounding thanks to those AKM converters and its compact size makes it ideal for smaller or space-constrained racks—perfect for anyone recording external synths or integrating ADAT-based instruments into their modular system.
Pros
- Exceptional AKM 'Velvet Sound' converters deliver pristine audio fidelity.
- Compact 12HP footprint maximizes valuable modular space.
- Flexible input/output configuration caters to diverse signal types.
Cons
- Mini-jack connections can be fragile with heavy patching.
- Power draw requires a robust PSU, especially when expanded.
48AudioFu
IndexStableno change since Aug 14Aug 14$402 now$402€359 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
Vermona Modular qMI2 - quad Midi interfaceVermona Modular45↓ 0.8%$409€365$409€365Check ↗
- 12
Vermona Modular TAI-4Vermona Modular44Stable$412€368$412€368Check ↗
- 13
Xaoc Devices Sewastopol II Audio Port & Voltage ExpanderSewastopol II · XAOC Devices56Stable$290€259$290€259Check ↗
- 14
Befaco CV Thing Eurorack Synthesizer ModuleCV Thing · Befaco57Stable$279€249$279€249Check ↗
- 15
Intellijel Designs Audio I/O (2023)Intellijel Designs50Stable$312€279$312€279Check ↗
- 16
ADDAC 220 Dual Envelope Follower+ADDAC41↑ 10.2%$413€369$413€369Check ↗
- 17
Expert Sleepers Disting MK4 Multifunction Eurorack Synth ModuleDisting mk4 · Expert Sleepers70Stable$208€186$208€186Check ↗
- 18
Intellijel Designs uMIDIIntellijel Designs50Stable$274€245$274€245Check ↗
- 19
XAOC Devices Drezno IIXAOC Devices43Stable$308€275$308€275Check ↗
- 20
Joranalogue Audio Design Transmit 2Joranalogue Audio Design60Stable$218€195$218€195Check ↗
- 21
ADDAC 711 Balanced InputsADDAC40↑ 12.0%$312€279$312€279Check ↗
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Vermona Modular Twin OutVermona Modular44Stable$290€259$290€259Check ↗
- 23
Joranalogue Audio Design Receive 2Joranalogue Audio Design60Stable$210€188$210€188Check ↗
- 24
BASTL Instruments 1983 Polyphonic MIDI to CV Interface1983 · Bastl Instruments50Stable$256€229$256€229Check ↗
- 25
Intellijel Designs MIDI 1UIntellijel Designs50Stable$255€228$255€228Check ↗
- 26
Befaco I4 Instrument InterfaceBefaco48Stable$263€235$263€235Check ↗
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Intellijel Designs Stereo I/O 1UIntellijel Designs50Stable$241€215$241€215Check ↗
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Intellijel Designs StompIntellijel Designs50Stable$234€209$234€209Check ↗
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Expert Sleepers NTX-8CVExpert Sleepers48Stable$223€199$223€199Check ↗
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Hexinverter Électronique Mutant BrainHexinverter Électronique41Stable$233€208$233€208Check ↗
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Doepfer A-119 Ext.In External Input / Envelope FollowerA-119 · Doepfer · 2 finishes82Stable$84€75$84€75Check ↗
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Befaco InAmp Eurorack Synthesizer ModuleInAmp · Befaco72Stable$144€129$144€129Check ↗
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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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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 ↗
- 37
Expert Sleepers ES-6 MK3 CV / Lightpipe Interface Eurorack Synth…ES-6 mk3 · Expert Sleepers57↓ 5.9%$178€159$178€159Check ↗
- 38
Doepfer A-190-8 USB / MIDI Sync InterfaceA-190-8 · Doepfer55Stable$140€125$140€125Check ↗
- 39
Befaco Out 1U Eurorack Synthesizer Module1U Out · Befaco54Stable$100€89$100€89Check ↗
- 40
Behringer Cu1ABehringer53↓ 44.7%$53€47$53€47Check ↗
- 41
Intellijel Designs Pedal I/O JACKS 1UIntellijel Designs50Stable$27€24$27€24Check ↗
- 42
Intellijel Designs Line Out 1UIntellijel Designs50Stable$44€39$44€39Check ↗
- 43
Intellijel Designs Stereo Line In 1UIntellijel Designs50Stable$83€74$83€74Check ↗
- 44
Intellijel Designs Stereo Out 1UIntellijel Designs50Stable$87€78$87€78Check ↗
- 45
Intellijel Designs Headphones 1UIntellijel Designs50Stable$87€78$87€78Check ↗
- 46
Intellijel Designs Pedal I/O 1U V2Intellijel Designs50Stable$115€103$115€103Check ↗
- 47
Intellijel Designs OutsIntellijel Designs50Stable$188€168$188€168Check ↗
- 48
Doepfer A-139-2 Headphone AmplifierDoepfer49Stable$66€59$66€59Check ↗
- 49
Doepfer A-190-7 1UDoepfer49Stable$72€64$72€64Check ↗
- 50
Doepfer A-119-2Doepfer49Stable$73€65$73€65Check ↗
- 51
Doepfer A-192-2Doepfer49Stable$144€129$144€129Check ↗
- 52
Befaco 1U STAmpBefaco48Stable$88€79$88€79Check ↗
- 53
Befaco Output V3Befaco48Stable$161€144$161€144Check ↗
- 54
Behringer CM1A MIDI to CV Eurorack ModuleCM1A · Behringer47↓ 2.5%$44€39$44€39Check ↗
- 55
ADDAC 309 CV to ExpressionADDAC46Stable$84€75$84€75Check ↗
- 56
4ms Percussion Interface + Exp.4ms46↓ 3.6%$178€159$178€159Check ↗
- 57
NANO Modules ST-OUTNANO Modules43Stable$151€135$151€135Check ↗
- 58
NANO Modules ST-INNANO Modules43Stable$151€135$151€135Check ↗
- 59
ADDAC 710 Balanced OutputsADDAC43↑ 5.7%$207€185$207€185Check ↗
- 60
Behringer Perfect Pitch PP1 Eurorack ModulePerfect Pitch PP1 · Behringer42↓ 3.9%$83€74$83€74Check ↗
- 61
vpme.de trig31vpme.de42↓ 2.9%$151€135$151€135Check ↗
- 62
Strymon AA1 Level ShifterStrymon42↓ 2.1%$154€138$154€138Check ↗
- 63
Erica Synths Pico OutputErica Synths41Stable$106€95$106€95Check ↗
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ADDAC 200PI Pedal IntegratorADDAC41↑ 9.5%$129€115$129€115Check ↗
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4ms Listen IO4ms40↑ 7.8%$156€139$156€139Check ↗
- 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
Latency
This is huge. Even a few milliseconds can throw off your timing, especially when sequencing or playing live. Cheap modules often have noticeable latency, which ruins the feel - you'll notice it when trying to play a fast bassline or sync a drum pattern.
Resolution & Step Precision
Forget those modules with clunky, quantized steps. Advanced players need surgical control over timing and pitch. We're talking about modules capable of sub-step resolution and smooth interpolation - the kind of detail that lets you sculpt truly organic rhythms.
Modulation Matrix Depth
A shallow matrix limits your creative potential. We're looking for modules with multiple destinations, LFO routing options, and the ability to modulate modulation - essential for complex sound design and evolving textures.
Sequencing Modes & Features
Beyond simple step sequencing, advanced players need things like probability, triplets, swing, and the ability to create complex patterns with multiple lanes. A module that only does linear sequences is a bottleneck.
Build Quality & Reliability
Modular synths are investments. A flaky module that cuts out mid-gig or loses its settings is a nightmare. Solid construction, robust encoders, and a reliable power supply are non-negotiable.
Buying guide
So, you're past the basic Eurorack setup and craving real nuance in your modular workflow? Interface modules aren't just for knob-per-function anymore. We're talking about modules that impact your timing, your dynamic response, and your overall creative control - and that means stepping up your game. Let's break down which ones will actually elevate your patching, not just add another layer of complexity.
Don't chase the 'coolest' module just for the aesthetics. Seriously consider your existing system and what you're trying to achieve. Interface modules are often the glue that holds everything together, so spend a little more for a module that's rock-solid and offers the features you truly need.
Cheap modules often skimp on the analog components or the firmware, leading to jittery timing or limited functionality - that's money wasted.
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 an interface module?
A sequencer generates patterns. An interface module controls those patterns or other modules - it's about routing, modulation, and adding nuance to what's already happening. Think of a sequencer as the composer, and the interface module as the conductor.
How much latency is acceptable?
Ideally, you want latency under 1ms. Anything above 5ms will likely be noticeable, especially when playing live or trying to synchronize multiple modules. It's not always a dealbreaker, but be aware of the trade-off.
Can I use a computer as an interface module?
Sure, but it introduces a whole new set of potential problems: USB latency, driver instability, and the added complexity of software. A dedicated hardware interface is generally more reliable and offers a more tactile experience.
I'm on a budget. Where can I cut corners?
Don't skimp on latency or resolution. Those are fundamental to playability. You can save money by opting for fewer modulation destinations or less complex sequencing modes, but prioritize timing accuracy above all else.
How do I know if a module is 'advanced' enough for me?
If you find yourself constantly wishing a module could do more, or if you're frustrated by limitations in its sequencing or modulation capabilities, it's probably time to upgrade.
