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Therevox ET-4.1

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Page last updated Aug 10, 2025

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Description

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The Therevox ET-4.1 synthesizer is an analog instrument inspired by the classic Ondes Martenot and Trautonium, offering a unique and expressive approach to sound design. This hand-built synthesizer stands out with its dual analog oscillators that deliver a rich and dynamic range of tones. Drawing from historical designs, the ET-4.1 features a touch-sensitive pitch ribbon and a wooden key mechanism, allowing for a highly responsive playing experience that’s both tactile and intuitive.

What sets the Therevox ET-4.1 apart is its ability to produce seamless portamento and glissando effects, thanks to its ribbon controller. The instrument includes a wide array of modulation options, making it an excellent choice for musicians seeking to explore uncharted sonic territories. The ET-4.1 is equipped with a built-in spring reverb, adding another layer of depth to its already lush sound palette. Its robust construction and vintage aesthetic make it a captivating centerpiece in any studio or live setup.

Designed for adventurous musicians and sound designers, the Therevox ET-4.1 encourages exploration and creativity, providing a distinctive voice in the world of electronic music.

Key Features:

Dual analog oscillators with a wide range of waveforms
Touch-sensitive pitch ribbon for expressive playing
Wooden key mechanism for tactile control
Built-in spring reverb for natural sound enhancement
Extensive modulation capabilities
Hand-built with a vintage-inspired design
Seamless portamento and glissando effects through ribbon control

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Therevox ET-4.1 Features Demo Overview

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Therevox ET-4.1.

Features and functionality

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The Therevox ET-4.1 uses a string and ring mechanism, differentiating it from traditional theremins for easier navigation.
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The Therevox ET-4.1 includes built-in oscillators, a filter, and reverb, enhancing its versatility and sound quality directly out of the box.
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Comparisons

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The Therevox ET-4.1 is linked to its predecessors like the Tannerin and Ondes Martenot, highlighting its lineage and unique build.
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Use cases and applications

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Owners report the ET-4.1 excels in creating eerie, atmospheric sounds, ideal for horror or suspenseful music compositions.
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The ET-4.1's dual intensity keys expand its expressive capabilities, providing more dynamic control for performing intricate compositions.
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Build quality

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The Therevox is noted for its robust construction, suggesting a durable and reliable option among electronic instruments.
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Software and compatibility

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The Therevox ET-4.1 offers CV outputs, allowing it to control external synths, making it a flexible addition to any modular setup.
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Value and pricing

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Priced at $1650, the Therevox ET-4.1 includes comprehensive features, but buyers might consider seeking second-hand options for cost savings.
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Artist usage

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Joshua Bright

Singer, Guitarist

Verified via Photo

Joshua Bright utilized the Therevox ET-4.1 during the recording sessions for "And All Along a Wolf" -This is evidenced by a photo shared on February 18, 2015, by MAN LIKE MACHINE on Instagram, showcasing Giuseppe Di Cristino recording with the Therevox ET-4.1 for the album with producer Keith Blackmore. The caption accompanying the photo credits Joshua Bright, affirming his association with the Therevox ET-4.1 during these sessions.