Teisco SX-400

Teisco SX-400 Image

The SX-400 is a solid 4-voice analog synth. It is most comparable to the Roland Juno 6, but has a better expression-section. The aftertouch and handwheel can trigger vibrato, cutoff and pitch at the same time, variable in speed and sensitivity. Available effects include an Ensemble (chorus) and a Portamento glide-effect. The sub & noise OSC and ensemble-switch are cool and make the SX-400 good for techno and acid too. Unfortunately there are no arpeggiators or sequencers.

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9 Visitor comments
Jay B
February 6, 2014 @ 3:36 pm
I might be able to shed some light on the "secret" behind the fat sound of this machine, apart from being able to stack the 4 oscillators and the triple-chorus, it hides a big surprise beneath the bonnet.

When opening mine up, I discovered to my delight that it has 4 discrete 24 dB transistor ladder filters, like the classic MiniMoog filter, albeit without the bass boost of the Mini, but who wants that anyway, you always have to EQ it away when mixing. It has all the character of a Moog filter x4 and sits perfectly in the mix, it's a beast.
February 2, 2014 @ 4:59 pm
The SX400 is nothing like a Mono/Poly - first of all it has 4 VCF's, 1 per voice. The SX is a true polyphonic, not paraphonic like the MP4. The MP4 can on the other hand do many things which the SX cannot. Very different synths, I own both.

SX400 is an (almost) identical copy of the JP4 function wise, but the construction inside differ a lot. Instead of arpeggiator Teisco put in detuneable oscs, aftertouch and three LFO's. All other specs are very alike.

I've made this demo just with the SX400:

And yes, the SOS article is pure hogwash...
January 29, 2014 @ 11:11 am
This is an absolute beast, my favorite secret weapon besides the Waldorf Microwave 1. This thing sounds incredible, especially in unison, when each oscillator has a different octave. When you play it monophonic it can pretty much sound like a Moog in the upper octaves, due to its filter. The bass sounds different though. But it's still "fat". And it's funky as hell. If you're looking for those classic Funkadelic leads or Kraftwerk chords, this thing nails it. I'd prefer it over any Roland except the J8.
January 2, 2014 @ 2:23 pm
I really cannot understand why VintageSynth always compares with Juno. This Synthesizer has nothing to do with Juno. It's just like comparing apples with oranges... This Synthesizer is similar to Korg Mono/Poly.

Anyway, vintagesynth has very bad articles... Juno is not the only Analog Synth out there...
October 20, 2011 @ 11:54 am
Just saw this rather unfvourable review in Sound on Sound:

VSE Rating

It’s Good

User Rating

Rated 3.48 (155 Votes)

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  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 4 voices
  • Oscillators - (4): 4 in Mono-mode, 2 in Dual-mode, 1 in Quad-mode, fine tuning and range for each OSC. Saw, pulse, tri, (16' 8' 4' 2') waveforms.
  • LFO - (2): 1 with frequency, delay, saw, pulse, tri; 1 simple sine LFO
  • Filter - 24 dB/oct resonant, self-oscillating, LFO-Mod, EGI-Mod with reverse mode.
  • VCA - ADSR, LFO-Mod
  • Keyboard - 49 keys w/ aftertouch
  • Memory - 8 factory, 8 user
  • Control - CV/GATE
  • Date Produced - 1981 - 1982

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