J4 | Kontakt Instruments | Kontakt Hub
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Version: Kontakt 5.2.1 / NCW / V1

Legendary Jupiter 4 Inspired 1970 Synth


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Download Method: Kontakt Hub

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Product Overview

Inspired by a legendary 4 voice Japanese analogue synthesizer from the late 1970s, 'J4' also includes an extremely comprehensive sequencer.

'J4' features 2 different sets of samples - one set recorded 'DI', with a NEVE style pre-amp/eq and boutique valve mixer at 48khz/24 bit.

The second set uses the same method, but has also been recorded to brand new 'old-stock' tape at 15ips on a Studer A807 quarter inch reel-to-reel recorder.

Please Note: The full version of Kontakt 5.2.1 or above is required. Not for Kontakt Player

Kontakt Player Download Manual


5 Stars (8)
★ ★ ★ ★ ★ Verified Review

One of my favorites!

This synth is so utterly useful and great sounding. I use it all the time at work. We write a lot of hybrid orchestral stuff and I find myself going to this one sometimes instead of other synths like Zebra. The filters sound great and it can be really sharp and percussive or long and thick. Well done!

Wayne Ingram

★ ★ ★ ★ ★ Verified Review

J4 un analogique Top, mais un peu oublier...

Un synthé analogique avec 6 formes d'onde, un step sequencer complet, arpeggiateur, LFO synchronisable...
Bref un super synthé dans kontakt qui mérite plus.
Rien à dire, il sonne et bien, réglage simple, effets efficace pour tous ype de musique.
Privilégiez des effets externe (Hardware) comme Lexicon, DBX, TubeTech ... pour redonner au son le "juice" et le grain qui faut pour le rendre parfait.
A part ça , terrrrrible je recommande
Bravo Tronsonic
et Merci a Kontalkt Hub


★ ★ ★ ★ ★ Verified Review

analog sound

powerfull secuencer

Terenzio Alejandro

★ ★ ★ ★ ★ Verified Review

Classic sound

Perfect for that warm Jupiter sound and the option to use the tape samples makes this thing sound so much more interesting than a lot of other emulations out there.

Erlinda Magallanez

★ ★ ★ ★ ★ Verified Review

Old Friend

Love Tronsonic stuff this maybe a fav though
I miss the chunk of furniture, that was, the J4 I once owned but not the back pain and service hassles
Vintage history on tap

Keith Chalker

★ ★ ★ ★ ★ Verified Review

Nice Synthesizer for Kontakt

Tronsonic made a nice Jupiter 4 like inspired Kontakt synth. It sounds warm and phat. Perfect!

Michael Wiedmer

★ ★ ★ ★ ★ Verified Review

A Hidden Gem with Great Sound and with Many Presets

I generally prefer my soft synths to be either Audio Units or VSTs, but this Kontakt-based soft synth is seriously impressive with its quality sound and with the several presets it comes with. And like a soft synth plugin this Kontakt instrument allows for parameter modulation, contains a sequencer, arp generator, and built-in effect units. In the end the sounds it creates feel retro and vintage, yet fresh for modern electronic music production. I would highly recommend this instrument for producers and sound designers looking for an expressive synth with lo-fi appeal.

Shannon McDowell

★ ★ ★ ★ ★ Verified Review

Real Analog Sound

You can almost smell the electricity melting the components. :)

Daniel Hogan

Demo - League of Early Humans

Check out this demo from Anthony Lee using the sounds of J4 from Tronsonic. Here's what he had to say about sounds:

"I'm so impressed with the crazy sounds this synth produces - they remind me so much of early analog synths, early Human league, Depeche Mode etc. Lots of depth, weight, unexpected movement and lashings of modulations options - the best that Tronsonic has to offer in my opinion, a no-brainer."

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