cosmotronic/vortex
Vortex
Analog complex dual oscillator with two independent triangle-core VCOs, through-zero linear FM, exponential FM, phase modulation, ring modulation, per-voice sinusoidal wavefolder, per-voice low pass filter, sync, and cross-modulation matrix.699
Capabilities 2
- Complex Oscillatorcomplex-oscillator
- Two independent triangle-core VCOs with dedicated signal paths and cross-modulation via FM, phase modulation, ring modulation, and sync.699
- Through-Zero FMthrough-zero-fm
- Both VCO1 and VCO2 support TZFM via the THRU ZERO knobs, with the FM INDEX controlling global modulation depth. VCO1 is modulated by VCO2's sine (normalized) and vice versa; external sources can be patched into the LINEAR inputs.699
Jacks 28 (20 in / 8 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (20) | |||
| VCO1 EXPO IN | cv | — | 699 |
| VCO1 FM INDEX IN | cv | — | CV input controlling global FM amount for VCO1. Normalized to VCO2 FM INDEX input (left input controls VCO1). FM INDEX knob acts as offset. Accepts bipolar signals.699 |
| VCO1 FOLD IN | cv | — | CV input for VCO1 wavefolder amount. Normalized to sine of VCO2. Accepts bipolar signals.699 |
| VCO1 LINEAR IN | cv | — | External through-zero linear FM input for VCO1. Normalized to sine of VCO2; patch any signal to override. Accepts bipolar signals.699 |
| VCO1 LPF IN | cv | — | CV input for VCO1 low pass filter cutoff. Normalized to sine of VCO2. Accepts bipolar signals.699 |
| VCO1 PHASE MOD DEPTH IN | cv | — | 699 |
| VCO1 PHASE MOD MOD IN | cv | — | Phase modulation source input for VCO1. Normalized to sine of VCO2; patch any signal to override.699 |
| VCO1 SHAPE IN | cv | -5V to 5V | 699 |
| VCO1 SYNC IN | audio | — | Sync input for VCO1. Normalized to the square wave of VCO2 via the toggle switch. Overrides internal normalization when patched.699 |
| VCO1 V/OCT | cv | — | V/Oct pitch CV for VCO1. High impedance input suitable for passive multiples.699 |
| VCO2 EXPO IN | cv | — | 699 |
| VCO2 FM INDEX IN | cv | — | CV input controlling global FM amount for VCO2. Left FM INDEX input is normalized to the right one (indicated by the arrow). Accepts bipolar signals.699 |
| VCO2 FOLD IN | cv | — | 699 |
| VCO2 LINEAR IN | cv | — | External through-zero linear FM input for VCO2. Normalized to sine of VCO1; patch any signal to override. Accepts bipolar signals.699 |
| VCO2 LPF IN | cv | — | 699 |
| VCO2 RING MOD DEPTH IN | cv | — | 699 |
| VCO2 RING MOD MOD IN | audio | — | 699 |
| VCO2 SHAPE IN | cv | ≤5V | 699 |
| VCO2 SYNC IN | audio | — | Sync input for VCO2. Normalized to the square wave of VCO1 via the toggle switch. Overrides internal normalization when patched.699 |
| VCO2 V/OCT | cv | — | V/Oct pitch CV for VCO2. High impedance input suitable for passive multiples.699 |
| Outputs (8) | |||
| VCO1 MAIN OUT | audio | — | 699 |
| VCO1 SINE OUT | audio | — | Sine output of VCO1, affected by sync settings and FM.699 |
| VCO1 SQUARE OUT | audio | — | 699 |
| VCO1 TRIANGLE OUT | audio | — | Triangle core output of VCO1, affected by the waveshaper, sync and FM.699 |
| VCO2 MAIN OUT | audio | — | 699 |
| VCO2 SAW OUT | audio | — | Saw output of VCO2, affected by sync settings and FM.699 |
| VCO2 SINE OUT | audio | — | Clean sine output of VCO2, bypassing both wavefolder and low pass filter. Also available pre-wavefolder/filter after the ring mod stage.699 |
| VCO2 SQUARE OUT | audio | — | Square output of VCO2, affected by sync settings and FM.699 |
Parameters 28
| Name | Type | Range | Behavior |
|---|---|---|---|
| FM INDEX | knob | — | Controls global FM amount for both VCO1 and VCO2 for linear and exponential FM. Acts as offset for FM INDEX CV inputs. LED indicator shifts from blue (low) to orange (high). Left FM INDEX input is normalized to right input.699 |
| SYNC Toggle | switch | — | 3-position toggle: center = sync disabled; right = VCO1 masters VCO2; left = VCO2 masters VCO1. Uses square waves derived from triangle cores for sync.699 |
| VCO1 Coarse Tune | knob | — | 699 |
| VCO1 EXPONENTIAL | knob | — | Sets the maximum amount of exponential FM for VCO1, attenuated by FM INDEX. Modulator normalized to sine of VCO2; external signal via EXPO input. Can be used for vibrato with an LFO, or approximate pitch tracking by maxing FM INDEX and setting knob to ~3 o'clock.699 |
| VCO1 Fine Tune | knob | — | 699 |
| VCO1 Fold Attenuator | knob | — | 699 |
| VCO1 Frequency Range | menu_setting | 20Hz – 20000Hz | 699 |
| VCO1 Hard/Soft Sync Switch | switch | — | Selects hard sync (up) or soft sync (down) for VCO1. Also applies when using external sync signals.699 |
| VCO1 LPF | fader | — | Controls the cut-off frequency of the 12dB/oct non-resonant low pass filter of VCO1. Top position = fully open; bottom = fully attenuated. CV modulation via LPF input normalized to sine of VCO2.699 |
| VCO1 LPF Attenuator | knob | — | 699 |
| VCO1 Octave Switch | switch | — | 699 |
| VCO1 Phase Mod Depth | fader | — | Controls the depth of phase modulation on VCO1. Slider acts as offset; DEPTH input (normalized to sine of VCO2) accepts bipolar CV; knob is attenuator. Maximum depth modulation with signals -5V to 5V.699 |
| VCO1 Phase Mod Depth Attenuator | knob | — | 699 |
| VCO1 Shape | fader | — | Continuously shapes the VCO1 waveform from SINE (bottom) through TRAPEZOID (middle) to SAW (top). Accepts bipolar CV modulation; slider acts as offset.699 |
| VCO1 Shape Attenuator | knob | — | Attenuates the shape CV modulation input (normalized to sine of VCO2 or external via SHAPE input).699 |
| VCO1 THRU ZERO | knob | — | Sets the maximum amount of through-zero linear FM for VCO1, attenuated by the global FM INDEX knob. Modulator normalized to sine of VCO2; external signal via LINEAR input.699 |
| VCO1 Wavefolder | fader | 0V – 5V | Increases amount of wavefolding applied to VCO1. Slider is 0V-5V DC offset; bipolar CV modulation accepted via FOLD input. Negative total sum attenuates signal to silence (usable as makeshift VCA).699 |
| VCO2 EXPONENTIAL | knob | — | Sets the maximum amount of exponential FM for VCO2, attenuated by FM INDEX. Modulator normalized to sine of VCO1; external signal via EXPO input.699 |
| VCO2 Fold Attenuator | knob | — | 699 |
| VCO2 Frequency Range | menu_setting | 20Hz – 20000Hz | 699 |
| VCO2 Hard/Soft Sync Switch | switch | — | Selects hard sync (up) or soft sync (down) for VCO2. Also applies when using external sync signals.699 |
| VCO2 LPF | fader | — | 12dB/oct non-resonant low pass filter identical to VCO1's LPF. Sine of VCO1 normalized as modulator. Top slider = fully open; bottom = fully attenuated.699 |
| VCO2 Ring Mod Depth | fader | — | Controls depth of ring modulation on VCO2. Slider bottom = no ring mod; slider top = full range ring mod with -5V to 5V signals. Normalized to sine of VCO1; external source via MOD input. Depth CV modulation also available.699 |
| VCO2 Ring Mod Depth Attenuator | knob | — | 699 |
| VCO2 Shape | fader | — | Continuously shapes VCO2 waveform from SINE (bottom) through TRIANGLE (middle) to INVERSE SAW (top). Normalized to sine of VCO1 for modulation; accepts bipolar CV via SHAPE input.699 |
| VCO2 Shape Attenuator | knob | — | 699 |
| VCO2 THRU ZERO | knob | — | Sets the maximum amount of through-zero linear FM for VCO2, attenuated by the global FM INDEX knob. Modulator normalized to sine of VCO1; external signal via LINEAR input.699 |
| VCO2 Wavefolder | fader | — | Controls wavefolding amount on VCO2 using a novel topology. Introduces some distortion even at minimum; maximum wavefolding with +5V. Negative total offset attenuates to silence (makeshift VCA). Normalized to sine of VCO1.699 |
Firmware history 0 versions
No firmware history recorded.
References 2
- [699]
- [700]