Pricing and availability

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Sweetwater
3.5 (3)
$125.00
Amazon
4.5 (10)
$125.00
Thomann
4.8 (5)
$126.00 $125.00 $1.00 · All time low

Average Price: $125

Budget/Beginner

$149

$350+

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Standard

High-end

Price History

Based on price data from 2 merchants for "4ms Listen I/O Eurorack Module". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

The 4ms Listen I/O Eurorack Module is your bridge between the modular world and external line-level equipment. Whether you're looking to incorporate synthesizers, dynamic microphones, or even guitars into your Eurorack setup, this module delivers seamless connectivity without compromising audio fidelity. With its stereo audio interface, you have a pair of line-level inputs to bring external signals into your module, and a pair of outputs to send your Eurorack creations back into your recording or performance gear.

The Listen I/O provides intuitive control with input gain and output level adjustments, allowing up to 30dB of gain, perfect for optimizing your signal flow. The module’s 4-segment LED meters ensure you maintain optimal levels and avoid dreaded clipping, keeping your sound pristine. Plus, the versatile outputs can double as stereo headphone outputs, offering flexibility for live monitoring or personal practice.

Designed to integrate easily with other 4ms Listen modules or WAV recorders via jumper cables, this module is a versatile addition to any Eurorack rig. Its compact design, utilizing just 6hp of rack space, makes it an efficient choice for modular enthusiasts looking to expand their sonic palette.

Key Features:

  • Line-level interface module for Eurorack modular synthesizers
  • 2 inputs for external signals with gain control for up to +30dB boost
  • 2 outputs with level control for converting Eurorack signals to line level
  • Outputs can be used as stereo headphone outputs
  • 4-segment LED meters for input and output monitoring
  • Compatible with other 4ms Listen modules and WAV recorders via jumper cables
  • Power usage: 62mA (+12V), 55mA (-12V)
  • Size: 6hp wide, 24mm deep

Product specs

Type Line-Level Interface Eurorack Module
HP Size 6HP
Power Supply Requires Eurorack case and power supply

FAQs

What is the primary function of the 4ms Listen I/O Eurorack Module?

The 4ms Listen I/O Eurorack Module serves as a line-level interface, allowing users to connect external audio equipment to their modular synth setup, facilitating both input and output of audio signals.

How many HP does the 4ms Listen I/O Eurorack Module require?

The 4ms Listen I/O Eurorack Module requires 6HP of space in your Eurorack system.

Does the 4ms Listen I/O need a separate power supply?

The 4ms Listen I/O requires a Eurorack case and power supply to function, as it draws power from the Eurorack system itself.

Can the 4ms Listen I/O be used to connect external audio devices to a modular synth?

Yes, the 4ms Listen I/O is designed to interface external audio devices with a modular synthesizer, allowing for seamless integration of line-level audio signals.

Is the 4ms Listen I/O suitable for both input and output tasks in a modular system?

Yes, the 4ms Listen I/O is capable of handling both audio inputs and outputs, making it versatile for routing audio within a modular setup.

Reviews

PROS

  • Compact form factor saves valuable rack space

  • Solid LED feedback for input and output levels

  • Enables seamless integration of external effects at line level

  • Allows for both mono and stereo input/output configurations

  • Reliable performance with no hiss or noise issues

  • Ideal for connecting iPads and other external devices to modular setups

CONS

  • Interface is less refined compared to some other brands

  • Input and output levels adjust simultaneously, limiting channel-specific control

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about 4ms Listen I/O Eurorack Module.

Features and functionality

  • The Listen IO can boost line level inputs by up to +30dB, which is sufficient for converting instrument level signals but may increase noise floor.

    Source
  • The Listen IO module offers stereo in and out capabilities, which is beneficial for users with multiple guitar effects and for integrating with a Eurorack setup.

    Source

Use cases and applications

  • Using a DI box or preamp between a guitar and the Listen IO module can help manage noise floor issues when connecting guitars.

    Source
  • Sending signals from the Listen IO to a module like Compare 2 can facilitate triggering other events or percussion modules within a Eurorack system.

    Source
  • The Listen IO can act as a bridge for integrating modular synths with external instruments, especially useful for users lacking a functioning guitar amp or mixer.

    Source

User experience

  • The Reverend Double Agent guitar with a high output impedance (bridge about 13k) works well with the Listen IO, reducing the need for excessive gain.

    Source
  • The Listen IO is noted for its compatibility with a variety of instruments, making it versatile for different musical setups, especially for those combining guitar effects with modular synths.

    Source

Mods and upgrades

  • Boosting the guitar signal with a mixer or transparent volume boost pedal, providing up to +30dB gain, improves usability with the Listen IO.

    Source

Critic Reviews

4MS Listen Four, Listen Four Quarters, Listen IO & Listen Up

soundonsound.com

4MS has crafted a versatile suite of Eurorack mixer modules that blend functionality with clever design. The Listen Four and its variants offer impressive flexibility with the ability to link multiple units, making it easy to manage audio within compact setups. The headphone output and straightforward connectivity are standout features, especially for live tweaking. However, the lack of EQ, effects sends, or CV control might leave some users wanting more. While these modules excel in simplicity and utility, they may not satisfy those seeking deeper sonic manipulation. Overall, they fit well in a well-stocked rack, albeit with limitations.

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