Synthesis Technology E951 Looping Expander

0 wishlisted

0 saved

Page last updated Mar 31, 2026

Pricing and availability

Store

Reviews

Price

^* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

Edit description

The Synthesis Technology E951 Looping Expander is a versatile addition to your modular synthesizer setup, designed to expand the functionality of your E950 Circuit Bent VCO. This expander allows you to unlock new creative avenues by enabling looping of the speech and effects in your E950, turning your modular rig into a dynamic sound playground. The E951 offers an intuitive interface with easy access to the looping modes, making it a great tool for both live performances and studio work.

With the E951, you can capture and loop segments of audio, providing you with endless possibilities for sound manipulation and experimentation. Whether you’re looking to create complex rhythmic patterns or build evolving textures, this expander has you covered. It seamlessly integrates with your existing modular setup, preserving the original character of your E950 while adding a new dimension of sound-shaping potential.

Designed for ease of use, the E951 features simple controls that allow you to quickly switch between different looping modes, ensuring that your focus remains on making music rather than navigating complex menus. This makes it an ideal choice for musicians who value both creativity and workflow efficiency.

Key Features:

Expands the functionality of the E950 Circuit Bent VCO with looping capabilities
Intuitive interface for easy access to looping modes
Ability to capture and loop audio segments for sound manipulation
Ideal for both live performances and studio use
Seamless integration with existing modular synthesizer setups

Product specs

Brand	Synthesis Technology
Model	E951 Looping Expander
Year	2010s
Made In	United States
Categories	Eurorack Modules and Cases, Synth Modules
Horizontal Pitch	10HP
Modular Synth Format	Eurorack
Synth Module Function	Expander

FAQs

What does the Synthesis Technology E951 Looping Expander do?: The Synthesis Technology E951 Looping Expander is an expander module for the E950 Circuit Bent VCO, adding looping and sample playback capabilities to your Eurorack setup.
How does the E951 Looping Expander integrate with my current Eurorack system?: The E951 Looping Expander easily integrates into your Eurorack system, requiring 10HP of space and connecting directly to the E950 Circuit Bent VCO to expand its functionality.
Can the E951 Looping Expander be used independently from the E950 Circuit Bent VCO?: No, the E951 Looping Expander is specifically designed to work as an add-on module for the E950 Circuit Bent VCO and cannot function independently.
What type of power supply does the E951 Looping Expander require?: The E951 Looping Expander requires a standard Eurorack power supply, connecting through a 16-pin ribbon cable to your modular system's power bus.

Videos

Add video

John L Rice

E951 LOOPING EXPANDER For The E950 Circuit Bent VCO

John L Rice

Synthesis Technology E951 Looper - Gearslutz @ KnobCon 2016

Gearspace Forum

Reviews

Add review

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Synthesis Technology E951 Looping Expander.

Features and functionality

0 0

The E951 adds looping functionality and display information to the E950 Circuit Bent VCO, enhancing its capabilities.
Source
0 0

The module's design includes custom PCB layouts for the OLED and jack boards, requiring specific skills in PCB fabrication and testing.
Source

Mods and upgrades

0 0

There's an opportunity to upgrade the display from the 4-pin .96" OLED to something more advanced, potentially adding extra features.
Source
0 0

The front panel has been updated with the original font and Synthesis Technology logo, enhancing its aesthetic appeal.
Source
0 0

Consider adding company logo and correct font to the panel for a professional look, similar to production run designs.
Source

Value and pricing

0 0

Current builds of the E951 are priced at $200 USD plus shipping, with limited availability due to part constraints.
Source

User experience

0 0

The E951 is in high demand, with several modules already claimed and a waiting list forming for future builds.
Source

Software and compatibility

0 0

The E951 works as a control module for the E950, which emulates the Speak and Spell voice module using software rather than hardware chips.
Source

Build quality

0 0

The new PCB design switches from Doepfer to Thonk jacks, which may affect durability and fit within the module casing.
Source
0 0

Aluminum PCBs with black mask and white silk screen offer a clean aesthetic, with potential for customization in different color schemes like purple with white silk screen.
Source
0 0

All jacks and switches align correctly on the panel, ensuring a seamless assembly once display alignment is adjusted.
Source

Setup and maintenance

0 0

Redundant paths on the OLED PCB can minimize cracked pad connections but may introduce RF interference if not handled properly.
Source
0 0

Avoiding right angles on the jack PCB is recommended for improved signal integrity in the circuit design.
Source
0 0

Initial panel design had misaligned upper mounting holes by a few millimeters, requiring file corrections before ordering another set.
Source
0 0

Display hole is slightly oversized, revealing the inside of the module; resizing is necessary for a perfect fit.
Source