DemonBox Eternal Research - Knobcon 2026

video upload by sonicstate

"We spoke to Jordan from Eternal Research about DemonBox, a triangular electromagnetic instrument and controller. He explained how it reacts to electromagnetic fields from motors, magnets, speakers, phones and other implements, turning those interactions into audio, CV and MIDI.

DemonBox has 33 inductors on its surface, arranged as three channels of 11 in concentric spirals. It has no internal oscillators or tone generators; the audio output comes from disturbances in the electromagnetic field, closer to a wide-field pickup than a synth voice. MIDI notes control instruments such as HydraSynth, while MIDI data can also drive TouchDesigner visuals and DMX lighting via conversion.

The unit includes three external audio inputs, one for each inductor channel. Incoming audio can be mixed with the knobs, and it also affects outgoing MIDI and CV. MIDI runs over USB-C, the unit is powered by 5V USB power, and CV is available for modular hardware. DemonBox is priced at $999, with an in-person Knobcon 26 offer including a free Ferris wheel order.
More Info: https://eternalresearch.com"

Noir Synthétique: Eternal Engine MARS (Vacuum tube poly synth)

video upload by Noir Synthétique

"Eternal Engine - MARS (4vco paraphonic vacuum tube synth)"

Noir Synthétique: Eternal Engine APPARATUS (David Bowie cover)

video upload by Noir Synthétique

"Eternal Engine - Apparatus (Mono/duophonic 2 vco)
David Bowie Cover"

Noir Synthétique: Eternal Engine Apparatus

video upload by Noir Synthétique

MARS Vacuum-Tube Synthesizer: The Most Aggressive Modern Synth I've Ever Tested

video upload by Vulture Culture

0:00 Intro Jam
2:17 Mono Mode & Basic Oscillator Shapes
4:16 The Vacuum Tube Filter
7:49 Duo Mode / Polivoks-Style Duophony
8:47 Poly 1 Mode / Korg Mono/Poly Behavior
10:47 Ensemble Mode & Supersaw Sounds
14:14 LFO Shapes, Retrigger & One-Shot Mode
17:31 Sample & Hold Filter Modulation
20:16 FM Synthesis Overview
29:00 Pros & Cons
37:43 Closing Thoughts

"What happens when you build a vacuum tube-based hybrid synthesizer in a Soviet space lab and send it back from the future? Today we’re demoing, reviewing, and explaining MARS from Eternal Engine Electronic Musical Instruments — one of the strangest, most beautiful, and most aggressive modern synthesizers I’ve ever played.

MARS is often described as a four-voice polyphonic tube synthesizer, but architecturally it’s more accurately a paraphonic synthesizer. The four digital oscillator voices can be played across multiple notes, but they all share the same tube-based filter and vactrol-based amplifier. That puts MARS more in the tradition of instruments like the Korg Mono/Poly and Formanta Polivoks than a conventional analog polysynth.

In this video, I walk through the full architecture of the Eternal Engine MARS: the digital oscillator section, mono / duo / poly voice modes, pulse-width modulation, ensemble mode, FM synthesis, modulation matrix, envelopes, LFO, sample & hold, the gorgeous Nixie lamp interface, the resonant vacuum tube filter, and the asymmetric tube overdrive that gives this synth its raw, snarling character.

This is not a safe, polite, modern analog synth. MARS is boutique, unusual, heavy, beautifully built, and absolutely vicious when pushed. The tube filter and drive section give it a sound that feels alive in a way most modern synthesizers don’t — somewhere between vintage analog synth, industrial bass machine, experimental sound design box, and Soviet sci-fi artifact.

If you’re into industrial music, EBM, darkwave, synthwave, experimental electronic music, vintage synthesizers, boutique synths, tube distortion, paraphonic synthesis, analog filters, FM basses, PWM pads, or Polivoks-style aggression, MARS is worth hearing.

I also talk through who I think this synth is actually for — and who should probably pass on it. Because while I absolutely adore the sound, MARS is not a cheap “do everything” synth, and it’s not trying to compete with mass-market analog polysynths. It’s a character instrument. A monster. A special machine for people who want something truly different."

Decoding

video upload by Valhalla Vegas

"OP-1, Eternal Engine Apparatus Tube Synth"

Apparatus Mini Tube Synthesizer. Assembling in process

video upload by Eternal Engine EMI

"Just got the enclosures for our new tube synth Apparatus Mini — and I couldn't resist. Quickly recorded how it sounds fully assembled."

You might remember the Apparatus Mini project starting back in December. This is the first look at it in it's case enclosure.

Apparatus & Tom 1501 from UltraRare.SU

video upload by Futulyric

Demo https://ultrarare.su/

Apparatus | Tube Synthesizer | VST,AU

video upload by Futulyric

You can find demos of the hardware Apparatus tube synthesizer in previous posts here.

"The Apparatus plugin is a rompler based on meticulously sampled oscillators from the Eternal Engine EMI tube synthesizer of the same name. The plugin supports polyphony and allows you to utilize the sound of exclusive tube synthesis on a much more modest budget."

https://ultrarare.su/?product=apparat...

Eternal Engine Mars Polyphonic Vacuum Tube Synth Demo

video upload by Valhalla Vegas

Eternal Engine Apparatus All Vacuum Tube Synth Demo

video upload by Valhalla Vegas

Melodic Techno on MARS Tube Synthesizer (Dmitriy Shtatnov music)

video upload by Eternal Engine EMI

MARS Tube Synthesizer vs Ultrarare Formanta P432 VST Plugin

video upload by Eternal Engine EMI

"Our friends from UltraRare ( https://ultrarare.su ) have created a cool plugin: a VST version of the Soviet Formanta P432 synthesizer.
The plugin is a rompler with sounds from this Soviet synthesizer. One of the features of the software version is the ADSR envelope, which expands the instrument's sonic capabilities. The sound bank is controlled via MIDI, allowing users to freely switch between presets within a single part.
There's a lot more interesting stuff on the UltraRare page: https://ultrarare.su/?post_type=product"

Apparatus Mini - Starting new project

video upload by Eternal Engine EMI

"First start of the Apparatus Subminiature Tube Synthesizer.
More on https://apparatus.su"

MARS Tube Synhesizer - Good Preheat (D'n'B Demo track)

video upload by Eternal Engine EMI

More info on https://apparatus.su/mars.html

Additional demos

MARS Tube Synthesizer - Melodic Techno Patterns

video upload by Eternal Engine EMI

More info on https://apparatus.su/mars.html

0:00 - Pattern 1
1:02 - Pattern 2
2:07 - Pattern 3
3:10 - Pattern 4
4:12 - Pattern 5

MARS Polyphonic Tube Synthesizer (Dmitry Shtatnov)

video upload by Eternal Engine EMI

"More info on https://apparatus.su
Dmitry Shtatnov plays live on MARS Polyphonic Tube Synthesizer

0:00 - Theme 1
0:46 - Theme 2
1:51 - Theme 3
2:20 - Theme 4
2:45 - Theme 5
3:35 - Theme 6
4:15 - Theme 7
8:38 - Theme 8
9:25 - Theme 9
9:52 - Theme 10
10:33 - Theme 11
10:52 - Theme 12
11:04 - Theme 13
11:46 - Theme 14
12:23 - Theme 15
12:46 - Theme 16
13:11 - Theme 17
13:31 - Theme 18
14:28 - Theme 19
15:25 - Theme 20
17:58 - Theme 21
19:14 - Theme 22"

Dmitry Shtatnov plays Apparatus Tube Synthesizer

video upload by Eternal Engine EMI

"More info on https://apparatus.su
Dmitry Shtatnov plays improvisation on Apparatus Tube Synthesizer

0:00 - Teme 1
2:50 - Teme 2
4:30 - Teme 3
5:42 - Teme 4
8:05 - Teme 5
9:00 - Teme 6
9:28 - Teme 7
11:45 - Teme 8
13:00 - Teme 9
14:30 - Teme 10
16:08 - Teme 11
17:38 - Teme 12"

Apparatus Tube Synthesizer - Another three themes

video upload by Eternal Engine EMI

More info on https://apparatus.su

0:00 - Theme 1
3:29 - Theme 2
5:42 - Theme 3

Apparatus Tube Synthesizer - Explore the Space (Eternal Engine EMI)

video upload by Eternal Engine EMI

"The audio uses Wave Alchemy Magic7 reverb"