When Roland released the JX-10 in 1986, they essentially doubled down on what made the JX-8P special by building two complete synth engines into a single 76-key instrument, creating what would become their last full analog synthesizer before the digital era took over.
The JX-10 packs 12 voices of polyphony with two digitally controlled oscillators per voice, giving you 24 DCOs total to work with. Each oscillator offers sawtooth, pulse, square, and noise waveforms with PWM, and you can sync or cross-modulate between them for wild harmonic possibilities. The signal path runs through a resonant 24dB low-pass filter plus a high-pass filter, with two dedicated ADSR envelope generators handling both filter and amplitude control. There's a single LFO with sine, square, and random waveforms that can modulate oscillator pitch and filter cutoff, plus portamento, a dual chorus effect, and a chase-play delay function that creates rhythmic voice alternation between the upper and lower modules. The keyboard itself is a full 76 keys with velocity and aftertouch sensitivity, and you get dual stereo outputs so each of the two synth sections can be routed independently.
The real power comes from the bi-timbral architecture, which lets you split or layer the two internal synth engines across different MIDI channels. You can store 50 presets and 50 user patches internally, plus another 64 program patches that combine two tones with their own split and layer parameters. Optional memory cartridges expand storage further, and there's a basic real-time sequencer onboard for sketching out ideas. The optional PG-800 programmer gives you dedicated knobs for deeper editing without diving into menus. Players have consistently praised the JX-10 for its thick, complex sound character and robust build quality, though the MIDI implementation is fairly basic by modern standards and the plastic keys feel less premium than some competitors from that era.
