Synth Museum

"Synthesizer preservation via research and education."

The Web SynthArk


Kawai SX-240


Released: 1984

MSRP: $1695US


The SX-240 divides the SX-210 waveforms between two oscillators (adding detune) and adds ring mod, split capabilities, MIDI, and sequencer. Architecture Class: Conventional (subtractive).

Ebay Description:

The Kawai SX-240 is a 61 key 8 voice bi-timbral synthesizer, featuring dual oscillators (with sub and saw/pulse/square/noise waveforms), ring modulation, a resonant low pass analog filter, a high pass filter, dual ADSR envelopes, an LFO (saw/triangle/square waveforms), portamento/glissando, 48 presets, MIDI, and chorus.


Form Factor Dimensions Weight Audio Input Audio Output Communication Port Control Input Control Output Switch Input Power
61 keys W:886mm D:380mm H:130mm 12.9kg no stereo (+4/-10/-20dBm) MIDI IN OUT THRU MIDI sequencer clock MIDI sequencer clock program:inc sequencer:start/stop sustain wired (38W)


Compatibility Multitimbral Memory Program Memory External Storage External Programming UI Input UI Output
- N/A 48 tape no dedicated buttons LEDs LED display


Multitimbral Polyphony Unison Architecture
2 8:2osc 4:4osc 1:16osc yes DCO1+DCO2->VCF->VCA->HPF


Effects Pan Modulator Volume Modulator Headphone
chorus no LFO VCA-EG yes


Arpeggiator Arpeggiator External Sequencer Sequencer Memory Sequencer External Continuous Program Change
no N/A realtime 1 track 8 song, 1500 note pedal:start/stop MIDI:clock in/out:clock BendLever MIDI pedal


Key Pressure Chord Memory External Control External Sustain Key Scaling Velocity Curves
no yes MIDI MIDI pedal no


Name Signal Class Waveform Octave Range Amplitude Modulator Harmonics Modulator Pitch Modulator Wave Assign Modulator
DCO1 digital pulse saw sub 4' 8' 16' no PWM:LFO auto-bend BendLever LFO MIDI:PitchBend glissando portamento no
DCO2 digital square 4' 8' 16' no no auto-bend BendLever LFO MIDI:PitchBend glissando portamento no
Noise analog noise - no no no no
RingMod analog N/A - no no no no


Name Signal Class IC Resonant Shape Frequency Modulator Resonance Modulator Shape Modulator
VCF analog SSM2044 yes low pass (16Hz-20kHz) BendLever key LFO VCF-EG no no
HPF analog discrete no high pass (16Hz-8kHz) no no no


Name Level Rate Loop Polarity Trigger Level Modulator Rate Modulator
VCF-EG sustain attack decay release no no key LFO no no
VCA-EG sustain attack decay release no no key LFO no no


Name Waveform Delay Polarity Sync Delay Modulator Level Modulator Rate Modulator
LFO saw:up square triangle yes yes no no no no
Conventional Models
100F 100P 60F 60P 110F SX-400 SX-210 SX-240
K3 K3m