Synth DB

The Ultimate Synthesizer Database


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Teisco | SX-400


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.

It features stereo sound and 16 preset memories. 8 of which are user memories. It also features a Chorus Effect and offers CV gate control.

The unit can be played in one of 4 modes. Quad: one VCO can be assigned to one key at a time and played as in a chord. 
Dual: 2 VCO's are assigned to one key at a time and can be played as 4 notes for a thicker sound. Mono: 4 VCO's are assigned to one key at time. Therefore, four notes can be obtained by pressing one key. And last Solo: 1 VCO is assigned to one key but only one key is effective at a time.

Engine TypeAnalog
Voices (max)4
LFO1 with frequency, delay, saw, pulse, tri; 1 simple sine LFO
Engine Detailed1 VCO. Fine tuning and range for each OSC. Saw, pulse, tri, (16' 8' 4' 2') waveforms.
Filter (VCF)24 dB/oct resonant, self-oscillating, LFO-Mod, EGI-Mod with reverse mode.
Envelope (VCA)ADSR, LFO-Mod
Memory8 factory, 8 user
Key typeKeys
Produced:1981 - 1982
Legend: Obvious Y: Yes, N: No, N/A: Not Applicable
VCO Voltage Controlled Oscillator DCO Digital Controlled Oscillator
LFO Low Frequency Oscillator Sub Sub Oscillator
VCF Voltage Controlled Filter VCA Voltage Controlled Amplifier
Velocity As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key. Aftertouch Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.
Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.

Manuals, patches etc.


If you like to discuss or talk about synths in all forms (including VST and modular), you are welcome to join the Facebook group "The Hard, The Soft and The Modular".

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