Back in the late '80s, this synth stood out in Casio's home keyboard lineup by blending digital oscillators with a genuine analog filter, delivering sounds that punch above their weight for a compact performer.
At its core is Casio's SD Synthesis engine, using DCOs with 32 wildly varied waveforms—from nasal pulses and metallic timbres to saws, squares, and even white noise elements with built-in PWM and amplitude modulation for instant character. These feed into per-voice ADSR envelopes for filter and amp, a shared analog resonant low-pass VCF for that warm swoosh, and a single LFO handling pitch vibrato and tremolo. The 61 synth-action keys (velocity-sensitive on some reports) pair with mod and pitch wheels, plus straightforward editing controls for tones, leading to 30 presets and 30 user patches. MIDI In/Out/Thru keeps it relevant, while onboard chorus (three types), a drum machine with 20 rhythms, auto-accompaniment, and built-in speakers make it a one-box wonder for jamming or gigs. Stereo outs and a black finish on its portable frame round out the practical build.
Vintage players love its rugged, no-fuss vibe and those quirky waveforms that spark unique pads, basses, and leads—often compared to PPG flavors—though some note the filter's lighter bass response and basic MIDI as era trade-offs. It's a nostalgic gem for tinkerers chasing affordable hybrid tones today.
