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.