Korg Prologue 8

{
  "schema_version": "capability-v4",
  "id": "prologue8",
  "name": "Korg Prologue 8",
  "maker": "Korg",
  "clone_of": null,
  "type": "hybrid",
  "type_note": "The manual markets it as a 'keyboardist-oriented analog synthesizer' (p.3) with 8 ANALOG voices, but the spec line 'Analog sound generator + Multi digital sound generator' (p.82) and 'MULTI ENGINE is a digital sound generation engine' (p.26) make the signal path factually hybrid: 2 analog VCOs + 1 digital multi-engine per voice. Encoded 'hybrid' per the spec page.",
  "voices": 8,
  "multitimbral": "bi-timbral (max 2 timbres: main + sub; layer/crossfade/split, p.82)",
  "control_style": "dial-led",
  "device_class": "synth",
  "voicing": {
    "polyphony": 8,
    "unison": true,
    "unison_detune_spread": true,
    "portamento": true,
    "mono_legato": true
  },
  "voicing_note": "UNISON voice mode stacks all 8 voices mono with Detune 0-50 cents (p.21). VOICE SPREAD (stereo) via Program Edit (p.50). Portamento knob Off/0-127 + Portamento Mode Auto/On (p.20/50). mono_legato from 'EG Legato' Off/On retrigger control, active in Mono/Unison/Chord (p.50).",
  "oscillators": {
    "count": 3,
    "noise": true,
    "note": "per[0]=VCO1 and per[1]=VCO2 are the two analog VCOs ('two voltage controlled analog oscillators for each voice', p.23): waveforms square/triangle/sawtooth with a SHAPE knob (duty-cycle/PWM on square, p.24), OCTAVE 2'/4'/8'/16', PITCH +/-1200 cents -> detune true. per[1].sync=true: the SYNC/RING switch SYNC position forcibly syncs VCO2 to VCO1 (VCO2 is the slave, p.25). per[2] is the digital MULTI ENGINE (p.26), TYPE = NOISE / VPM / USR -- it has no fixed analog waveform set (NOISE has 4 filtered types; VPM 16 types; USR user-loaded) so per[2].waveforms=['_verify'] rather than coin tokens. oscillators.noise=true reflects the MULTI ENGINE noise generator (one of per[2]'s types), NOT a dedicated analog noise source.",
    "per": [
      {
        "engine_type": "analog-vco",
        "waveforms": [
          "square",
          "triangle",
          "sawtooth"
        ],
        "pwm": true,
        "sub": false,
        "sync": false,
        "octave_select": true,
        "octave_positions": 4,
        "detune": true
      },
      {
        "engine_type": "analog-vco",
        "waveforms": [
          "square",
          "triangle",
          "sawtooth"
        ],
        "pwm": true,
        "sub": false,
        "sync": true,
        "octave_select": true,
        "octave_positions": 4,
        "detune": true
      },
      {
        "engine_type": "digital-multi",
        "waveforms": [
          "_verify"
        ],
        "pwm": false,
        "sub": false,
        "sync": false,
        "octave_select": true,
        "detune": false
      }
    ]
  },
  "cross_mod": {
    "hard_sync": true,
    "osc_fm": true,
    "ring_mod": true,
    "note": "All three are VCO2-centric analog functions in the MODULATION sub-section (p.24-25). hard_sync: SYNC/RING switch SYNC position syncs VCO2 phase to VCO1. ring_mod: SYNC/RING switch RING position -- VCO1 ring-modulates VCO2. osc_fm: CROSS MOD DEPTH knob -- VCO1 modulates the pitch of VCO2. NOTE: SYNC and RING share one 3-position switch [RING, off, SYNC] so they are mutually exclusive in use, but both functions exist (p.25)."
  },
  "filters": [
    {
      "type": "lowpass",
      "slopes": [
        "_verify"
      ],
      "slope_switchable": false,
      "resonance": true,
      "self_oscillation": "_verify",
      "key_tracking": true,
      "drive": true
    }
  ],
  "filter_routing": "single",
  "filters_note": "1 analog low-pass VCF (spec '1 VCF', p.82; p.30). DRIVE switch 0%/50%/100% -> drive=true (p.31). KEYTRACK switch 0%/50%/100% -> key_tracking=true (p.31). RESONANCE knob -> resonance=true (p.30). slopes=['_verify'] + slope_switchable=false: the manual NEVER states a pole/slope count for the VCF and there is no front-panel slope switch (the only 'slope' hits describe keytrack rate) -- did NOT trust the prior's '2-pole/4-pole switchable' claim. self_oscillation='_verify': resonance can distort but self-oscillation is not claimed in the manual (p.30). The LOW CUT switch (p.31) is a separate HPF trim, not a second routable filter -> filter_routing stays single.",
  "envelopes": {
    "count": 2,
    "assignments": [
      "amp",
      "filter",
      "pitch"
    ],
    "stages": "ADSR",
    "note": "2 EG (spec p.82). AMP EG (ADSR, p.32) is hardwired to the VCA (amp). The second EG (ADSR, p.33) reaches VCF cutoff (FILTER EG INT, p.31), oscillator pitch (PITCH EG INT -> VCO2/VCO1+2/ALL, p.24), and LFO rate (p.33) -- assignments amp/filter/pitch."
  },
  "lfo": {
    "count": 1,
    "waveforms": [
      "square",
      "triangle",
      "sawtooth"
    ],
    "destinations": [
      "filter",
      "pwm",
      "pitch"
    ],
    "sync": true,
    "note": "1 LFO (spec p.82). WAVE switch square/triangle/sawtooth (p.34). TARGET switch [CUTOFF, SHAPE, PITCH]: CUTOFF->filter, SHAPE->pwm (wave-shape/duty modulation), PITCH->pitch (p.34). LFO Target OSC selects which oscillator (p.48). sync=true: MODE BPM syncs the LFO to arpeggiator tempo + LFO Key/Voice Sync on/off (p.34/48)."
  },
  "modulation": {
    "mod_matrix": false,
    "mod_matrix_size": null,
    "patchbay": false,
    "vibrato_lever": false,
    "note": "mod_matrix=false: no virtual-patch / mod-matrix in the manual. Routing is fixed-path: a single Mod-Wheel destination assignment (~31 targets, p.47), a single Expression-Pedal destination (p.47), and an incoming-aftertouch destination (p.49) -- single-slot assignments, not a freely-routable matrix. patchbay=false. vibrato_lever=false (mod wheel + pitch-bend wheel, p.20, not a vibrato lever)."
  },
  "performance": {
    "velocity": true,
    "aftertouch": false,
    "mod_wheel": true,
    "pitch_bend": true,
    "note": "velocity=true ('velocity sensitive' keyboard, p.82; MIDI chart Velocity Note On O, p.84). mod_wheel + pitch-bend wheel with Bend Range +/-1-12 (p.20/48). aftertouch=false: the keyboard does NOT generate aftertouch -- the MIDI chart shows After Touch Transmitted=X (p.84); 'MIDI Aftertouch' (p.49) only assigns a destination for INCOMING aftertouch from external MIDI, i.e. receive-only."
  },
  "fx_onboard": [
    "mod",
    "delay",
    "reverb"
  ],
  "fx_onboard_note": "FACT (spec p.82): 'Mod Effects (Chorus, Ensemble, Phaser, Flanger, User), Delay/Reverb'. MOD EFFECT switch cycles Chorus->Ensemble->Phaser->Flanger->User (p.35); DELAY/REVERB switch Off/Delay/Reverb (mutually exclusive spatial slot, p.36). The L.F. COMP analog compressor is prologue-16 ONLY (p.82) and is excluded. This is the one catalog synth whose onboard FX are in active use (rig.json fx_policy.mode=onboard).",
  "io": {
    "audio_out": "OUTPUT L/MONO + R (2x 6.3mm TS unbalanced, stereo) + headphones (6.3mm stereo)",
    "midi": true,
    "usb": true,
    "cv_gate": false,
    "note": "Rear panel p.7-8 + spec p.82. MIDI IN + MIDI OUT (5-pin DIN); USB-B (MIDI over USB). cv_gate=false: NO CV/Gate jacks; the only analog sync is SYNC IN (20V max) / SYNC OUT (5V pulse) for volca/DAW clock -- a clock pulse, not pitch/gate CV. EXPRESSION + DAMPER pedal jacks present (half-damper not supported, p.7)."
  },
  "morphology_overrides": [],
  "provenance": {
    "manual_path": "manuals/synths--korg-prologue8-manual.pdf",
    "confidence": "high",
    "last_verified": "2026-05-26",
    "manual_pages": [
      3,
      4,
      5,
      6,
      7,
      8,
      17,
      20,
      21,
      23,
      24,
      25,
      26,
      27,
      28,
      29,
      30,
      31,
      32,
      33,
      34,
      35,
      36,
      47,
      48,
      49,
      50,
      82,
      84
    ],
    "verify_via": "SM26 single-seat manual extraction (Opus general-purpose seat); SM34 (2026-05-26) STRUCTURAL migration capability-v3->v4 (control_style=dial-led + morphology_overrides[]=[]); SM36 council re-extraction with panel-image SSOT (2026-05-26): CC/Opus + Codex CLI + Gemini browser 3-seat council, panel images at manuals/synths--<id>-panel.jpg (SM35-landed) -- panel-grounded re-extraction.",
    "verify_note": "Manual-grounded. Stressors resolved: multi-engine encoded as per[2].engine_type=digital-multi (Noise/VPM/USR, p.26); VCO2 sync+ring both true (one shared SYNC/RING 3-pos switch, p.25); type=hybrid (analog VCOs + digital multi-engine, p.82); onboard FX listed as fact (p.82) with rig policy=onboard. Three fields honestly _verify: filters[0].slopes + filters[0].self_oscillation (never stated; no front-panel slope switch) and oscillators.per[2].waveforms (multi-engine has no enum-mappable waveform set). aftertouch=false (transmit X, receive-only, p.84). mod_matrix_size normalized int 0 -> null; io.midi/usb normalized to bool. SM34 (2026-05-26): STRUCTURAL migration capability-v3->v4 (top-level control_style='dial-led', morphology_overrides[] of length 0). Morphology grounded in real-hardware knowledge + the SM34 brief's per-synth assignment (panel-image backfill at manuals/synths--*-panel.jpg is a separate follow-on node). SM36 (2026-05-26): 3-of-3 council seats CONFIRMED control_style=dial-led + morphology_overrides[]=[] (panel image manual p1 top illustration -- the 8-voice variant -- shows ALL continuous controls as rotary knobs across VCO1/VCO2/MULTI ENGINE, MIXER, VCF (CUTOFF/RESONANCE/EG INT), AMP EG ADSR, EG ADSR, LFO RATE/INT, MOD EFFECT/DELAY-REVERB SPEED/TIME/DEPTH; switches handle WAVE/OCTAVE/MODE/TARGET selection but are structural not morphological). dial-led + no overrides matches the panel uniformly. provenance.fields.control_style bumped medium -> high.",
    "fields": {
      "type": {
        "conf": "high",
        "pg": 82
      },
      "voices": {
        "conf": "high",
        "pg": 82
      },
      "multitimbral": {
        "conf": "high",
        "pg": 82
      },
      "voicing.polyphony": {
        "conf": "high",
        "pg": 82
      },
      "voicing.unison": {
        "conf": "high",
        "pg": 21
      },
      "voicing.unison_detune_spread": {
        "conf": "high",
        "pg": 21
      },
      "voicing.portamento": {
        "conf": "high",
        "pg": 20
      },
      "voicing.mono_legato": {
        "conf": "high",
        "pg": 50
      },
      "oscillators.count": {
        "conf": "high",
        "pg": 82
      },
      "oscillators.noise": {
        "conf": "high",
        "pg": 26
      },
      "oscillators.per.0.waveforms": {
        "conf": "high",
        "pg": 23
      },
      "oscillators.per.0.detune": {
        "conf": "high",
        "pg": 24
      },
      "oscillators.per.1.sync": {
        "conf": "high",
        "pg": 25
      },
      "oscillators.per.2.engine_type": {
        "conf": "high",
        "pg": 26
      },
      "oscillators.per.2.waveforms": {
        "conf": "_verify",
        "pg": 26
      },
      "cross_mod.hard_sync": {
        "conf": "high",
        "pg": 25
      },
      "cross_mod.osc_fm": {
        "conf": "high",
        "pg": 25
      },
      "cross_mod.ring_mod": {
        "conf": "high",
        "pg": 25
      },
      "filters.0.type": {
        "conf": "high",
        "pg": 30
      },
      "filters.0.slopes": {
        "conf": "_verify",
        "pg": null
      },
      "filters.0.self_oscillation": {
        "conf": "_verify",
        "pg": null
      },
      "filters.0.key_tracking": {
        "conf": "high",
        "pg": 31
      },
      "filters.0.drive": {
        "conf": "high",
        "pg": 31
      },
      "filter_routing": {
        "conf": "high",
        "pg": 82
      },
      "envelopes.count": {
        "conf": "high",
        "pg": 82
      },
      "envelopes.stages": {
        "conf": "high",
        "pg": 32
      },
      "lfo.count": {
        "conf": "high",
        "pg": 82
      },
      "lfo.waveforms": {
        "conf": "high",
        "pg": 34
      },
      "lfo.destinations": {
        "conf": "high",
        "pg": 34
      },
      "lfo.sync": {
        "conf": "high",
        "pg": 48
      },
      "modulation.mod_matrix": {
        "conf": "high",
        "pg": 47
      },
      "modulation.patchbay": {
        "conf": "high",
        "pg": 82
      },
      "modulation.vibrato_lever": {
        "conf": "high",
        "pg": 20
      },
      "performance.velocity": {
        "conf": "high",
        "pg": 82
      },
      "performance.aftertouch": {
        "conf": "high",
        "pg": 84
      },
      "performance.mod_wheel": {
        "conf": "high",
        "pg": 20
      },
      "performance.pitch_bend": {
        "conf": "high",
        "pg": 48
      },
      "fx_onboard": {
        "conf": "high",
        "pg": 82
      },
      "io.audio_out": {
        "conf": "high",
        "pg": 82
      },
      "io.midi": {
        "conf": "high",
        "pg": 82
      },
      "io.usb": {
        "conf": "high",
        "pg": 7
      },
      "io.cv_gate": {
        "conf": "high",
        "pg": 82
      },
      "control_style": {
        "conf": "high",
        "pg": 1
      }
    }
  }
}