Pricing and availability

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Average Price: $96

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$149

$350+

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Price History

Based on price data from 1 merchant for "Frap Tools 321". Prices shown reflect NEW condition. Tracking began Apr 19, 2026.

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Description

Unleash the full potential of your modular synth setup with the Frap Tools 321—a versatile and compact three-channel module that brings a new level of precision and functionality to your sound design. Whether you're sculpting intricate audio landscapes or fine-tuning control voltages, the 321 is your ideal companion in the creative process. Each channel of this module offers a +6 dB level boost, allowing you to amplify signals with clarity and confidence. The phase inversion feature provides you with additional flexibility, enabling you to experiment with phase-aligned or inverted soundscapes effortlessly.

The Frap Tools 321 comes equipped with a DC-offset potentiometer, which not only lets you tweak your signals with meticulous detail but also serves as a standalone CV source when no cable is plugged into the input. This makes the 321 not just a utility module, but a potential powerhouse in any modular setup. Its total output with -6dB attenuators ensures that both audio signals and self-generated voltages are delivered with balanced precision. Whether you're working with audio signals or control voltages, the 321 is engineered to meet your exacting standards.

Key Features:

  • Three-channel module with +6 dB level boost per channel
  • Phase inversion capability for advanced sound design
  • DC-offset potentiometer, acting as a CV source when input is unplugged
  • Total output with -6dB attenuators for both audio and self-generated voltages
  • Suitable for both audio signals and control voltages
  • Compact design with 6 HP width and 38mm depth
  • Power requirement: +48mA (+12V) / -48mA (-12V)

Product specs

Available since April 2018
Switch Modul No
CV-Editor/VC-Processor Yes
Tools No
Width 6 TE / HP
Modul Type Mono

FAQs

What functions does the Frap Tools 321 module provide in a modular synthesizer setup?

The Frap Tools 321 module is a utility module designed for processing CV and audio signals. It offers three channels of amplification, attenuation, inversion, and offset, making it versatile for shaping and adjusting signals within your modular system.

How wide is the Frap Tools 321 module, and will it fit in my Eurorack case?

The Frap Tools 321 module is 6 HP wide, making it compact and suitable for most Eurorack cases. Its small size allows for efficient use of space while providing essential signal processing functions.

Can the Frap Tools 321 module process both audio and CV signals?

Yes, the Frap Tools 321 is designed to handle both audio and CV signals, offering flexibility in how you can route and manipulate signals within your modular synthesizer setup.

Does the Frap Tools 321 module include any built-in tools or switch modules?

The Frap Tools 321 does not include additional tools or switch modules. It focuses on signal processing functions like amplification, attenuation, inversion, and offset, without extra utility features.

Chris Meyer: Learning Modular + Alias Zone

Chris Meyer: Learning Modular + Alias Zone

Frap Tools 321 Scale + Flip + Shift + Combine (LMS: Eurorack Expansion)

Video thumbnail for Frap Tools 321 Scale + Flip + Shift + Combine (LMS: Eurorack Expansion) by Chris Meyer: Learning Modular + Alias Zone

Frap Tools 321 Scale + Flip + Shift + Combine (LMS: Eurorack Expansion)

Chris Meyer: Learning Modular + Alias Zone

Chris Meyer: Learning Modular + Alias Zone

Video thumbnail for 321 - Scale + Flip + Shift + Combine - Overview by Frap Tools

321 - Scale + Flip + Shift + Combine - Overview

Frap Tools

Frap Tools

Video thumbnail for Frap Tools 321 In-Depth Tutorial  |  Eurorack Amplifier, Inverter, Offset and Mixer for Audio and CV by Frap Tools

Frap Tools 321 In-Depth Tutorial | Eurorack Amplifier, Inverter, Offset and Mixer for Audio and CV

Frap Tools

Frap Tools

Reviews

PROS

  • Offers both CV and audio signal processing

  • Negative scale factor allows for signal inversion

  • Offset can be switched on or off for flexibility

  • Features sum inputs/outputs for mini-mixer functionality

  • Amplifies signals up to twice the original for overdrive effects

  • Includes a -6dB switch for managing hot signals

  • Exceptional build quality with top-quality components

  • Compact size (6 hp) packed with features

  • LEDs provide visual feedback for signal polarity

  • Functions as an attenuator, offset, mixer, and signal booster

CONS

  • Small pots may be uncomfortable for some users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Frap Tools 321.

Features and functionality

  • The Frap Tools 321 module is highlighted for its utility and affordability, often paired with modules like Cunsa for enhanced setup flexibility.

    Source
  • The Frap Tools 321 offers -6db sum attenuators, making it distinctive compared to the Happy Nerding 3xMIA, which has more channels but lacks this feature.

    Source

Use cases and applications

  • The 321 module is frequently used alongside other triple digit modules (333, 411) to optimize modular synth setups, particularly in Frap Tools-centric cases.

    Source
  • The Frap Tools 321 is suggested for users wanting multiple attenuverters with offset, enhancing modulation and mixing in generative ambient music setups.

    Source

User experience

  • Owners integrating the 321 module report satisfaction in its role within a broader ecosystem, often recommending it as a foundational piece in a modular synth setup.

    Source

Comparisons

  • Owners compare Frap Tools 321 favorably with the Happy Nerding 3xMIA, recommending both for enhanced modular synth capabilities due to their unique features.

    Source

Critic Reviews

Frap Tools 321 Module Lets You Slap It Up, Flip It, Rub It Down – Synthtopia

synthtopia.com

The Frap Tools 321 module serves as a practical utility in the modular synth world, allowing for signal scaling and phase adjustment. While it offers solid functionality at a reasonable price, critics argue it's not groundbreaking, leaning on familiar concepts rather than innovation. Some users appreciate its simplicity and utility, noting that basic tools can fuel creativity. However, others feel it lacks excitement, making it a mixed bag for those seeking cutting-edge features. Overall, it's a handy addition for some, but may not satisfy those looking for the next big thing in modular synthesis.

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Artist usage

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See how Andrew Huang uses Frap Tools 321

Andrew Huang

Singer, Guitarist

First Of October

...
Verified via YouTube

Shown up close in this August 29, 2020 video at 0:49.

Genre Usage

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Used With

Based on how musicians on Equipboard use Frap Tools 321, it is most commonly used with the following gear.

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