Dixie II+

Intellijel 8HP
VCO OSCILLATOR LFO

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Full-featured analog triangle-core VCO/LFO. Five simultaneous waveform outputs plus square sub, dual FM with selectable linear/exponential, PWM, hard sync and direction-flip sync.

Patch Ideas · 6

★ Classic hard-sync lead
Master VCO into Dixie SYNC · sweep Dixie pitch with envelope · take saw output · sharp timbral sweeps tracking keyboard pitch of the master
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 5 connections. Modules: Dixie II+, Master VCO, Sequencer, Envelope, Filter. Signals: 2 audio, 1 cv, 2 pitch.Dixie II+Master VCOSequencerEnvelopeFilterVCO mode · OCT 4: SYNCaudioFM2cv1V/OCT1v/octSAWaudioV/Oct1v/octSawaudioPitch1v/octOutcvInaudio11. hard-sync sweepaudiocvpitch
★ Linear-FM bell
Modulator VCO sine → Dixie FM1 · EXP/LIN set to LIN · FM1 attenuator ~noon · take SINE output · produces clean DX-style bells that still track 1V/oct
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 5 connections. Modules: Dixie II+, Modulator VCO, Sequencer, Envelope, VCA. Signals: 2 audio, 1 cv, 2 pitch.Dixie II+Modulator VCOSequencerEnvelopeVCAVCO mode · EXP/LIN=LIN · FM1 atten noon: FM1audio1V/OCT1v/octSINEaudioV/Oct1v/octSineaudioPitch1v/octOutcvCVcvInaudio11. linear FM bellaudiocvpitch
★ Sub-augmented bass
Saw to filter for main voice · SUB mixed underneath at equal level · PULSE width narrowed for click transient · thick square-octave-down bass with percussive attack
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 6 connections. Modules: Dixie II+, Mixer, Filter, Envelope, Sequencer. Signals: 4 audio, 1 cv, 1 pitch.Dixie II+MixerFilterEnvelopeSequencerVCO mode · PW ~11 o'clock: 1V/OCT1v/octSAWaudioSUBaudioPULSEaudioIn 1audioIn 2audioIn 3audioOutaudioInaudioCutoffcvOutcvPitch1v/oct11. fat bass + sub + clickaudiocvpitch
Six-output LFO bank
VCO/LFO switch to LFO · OCT low · use all six outputs as independent LFOs: sine to filter, saw to pan, zig-zag to VCA, pulse as clock divider, sub as half-rate trigger source
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Dixie II+, Filter, Panner, VCA, Clock Divider, Envelope. Signals: 3 cv, 1 trigger, 1 clock.Dixie II+FilterPannerVCAClock DividerEnvelopeLFO mode · OCT 1 · FINE 12 o'clock: SINEcvSAWcvZIG-ZAGcvPULSEclkSUBtrigCutoffcvCVcvCVcvInclkTrigtrig11. one module, six LFOscvtriggerclock
Audio-rate PWM squelch
Audio-rate LFO or second VCO sine into PWM · PWM attenuator ~2 o'clock · PULSE output sweeps duty cycle at audio rate · produces syncopated, hollow timbres without a filter
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: Dixie II+, Modulator VCO, Sequencer, VCA, Envelope. Signals: 1 audio, 2 cv, 1 pitch.Dixie II+Modulator VCOSequencerVCAEnvelopeVCO mode · PW noon · PWM atten 2 o'clock: PWMcv1V/OCT1v/octPULSEaudioSinecvPitch1v/octInaudioCVcvOutcv11. audio-rate PWM hollow timbreaudiocvpitch
Flip-sync soft FM
Modulator saw into FLIP input · produces inharmonic overtones without phase-locking to a single hard-sync edge · softer, more vowel-like than SYNC · pair with BPF for formant sweeps
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 5 connections. Modules: Dixie II+, Modulator VCO, Sequencer, BPF, LFO. Signals: 2 audio, 1 cv, 2 pitch.Dixie II+Modulator VCOSequencerBPFLFOVCO mode · OCT 4: FLIPaudio1V/OCT1v/octTRIANGLEaudioV/Oct1v/octSawaudioPitch1v/octInaudioCutoffcvOutcv11. flip-sync formant sweepsaudiocvpitch

Behaviors

Simultaneous Waveforms always

All six outputs are live at once. Patch triangle to the filter while sending pulse to a ring mod and sub to the bass path — one VCO fans out into parallel voices.

Hard Sync vs Flip Sync SYNC / FLIP inputs

SYNC resets the core to zero, producing the classic hard-sync sweep timbre. FLIP reverses direction of travel instead, yielding softer, less phase-locked harmonics — useful for pseudo-linear-FM effects without losing pitch.

Linear FM Mode EXP/LIN switch = LIN

FM1 becomes linear-response FM. Pairs with an AC-coupled audio-rate modulator for DX-style bell and metallic tones while 1V/OCT still tracks cleanly at the pitch input.

LFO Mode VCO/LFO switch = LFO

Frequency range drops to LFO territory. All six outputs still live, so one module provides sine, triangle, zig-zag, saw, PWM pulse and sub-octave square LFOs simultaneously.

PWM Range PULSE WIDTH + PWM input

Knob and CV sum. At duty-cycle extremes (0% or 100%) the pulse goes silent — useful for envelope-style gating off the PWM jack or as a hard mute trick.

Controls

Global OCTAVE 8-position slide switch sets coarse tuning in octave steps.
8 positions · 1 octave per step · highest positions can clip LFO upper limit
FM1 EXP/LIN Selects response curve of the FM1 input.
EXP: musical FM · LIN: through-zero-style timbral FM
Global FINE Fine tuning knob. Range depends on VCO/LFO mode.
VCO: ±6 semitones · LFO: ±7 octaves
Global VCO/LFO Switches between audio-rate and low-frequency operation.
VCO: 20 Hz–~60 kHz · LFO: several minutes up to ~1 kHz
FM1 FM1 Attenuator Scales depth of the FM1 input before summing.
CCW: zero · CW: unity · unipolar attenuator
PWM PWM Attenuator Scales depth of the PWM CV input.
CCW: zero · CW: unity · unipolar attenuator
PULSE PULSE WIDTH Sets base pulse duty cycle of the PULSE output, summed with PWM input.
CCW: 10% · noon: 50% square · CW: 90% · can hit 0%/100% for silence

I/O

IN · 6

  • FM1 audio/CV CV
    Frequency modulation input; curve set by EXP/LIN switch and scaled by FM1 attenuator
  • FM2 CV CV
    Dedicated exponential frequency modulation input (no attenuator)
  • PWM ±5V GATE
    Pulse-width modulation input summed with PULSE WIDTH knob
  • 1V/OCT 1V/oct
    Primary pitch control input, precision tracking
  • SYNC audio/gate GATE
    Hard sync: waveform resets to zero on each zero-crossing of incoming signal
  • FLIP audio/gate GATE
    Soft sync alternative: flips direction of triangle-core travel on zero-crossings instead of resetting

OUT · 6

  • SINE ~10 Vpp
    Sine wave output
  • TRIANGLE ~10 Vpp
    Triangle wave output
  • ZIG-ZAG ~10 Vpp
    Zig-zag (asymmetric triangle) output
  • SAW ~10 Vpp
    Sawtooth wave output
  • PULSE ~10 Vpp GATE
    Pulse wave with width set by PULSE WIDTH knob + PWM input
  • SUB ~10 Vpp
    Square sub-oscillator, 50% duty cycle one octave below primary