QXG

Make Noise 12HP
VCA VCF MIXER

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Quad Stereo Gate — four-channel stereo low pass gate and mixer. 100% analog vactrol-free LPG circuit with voltage-controllable stereo spread. Designed to pair with PoliMATHS and MultiWAVE in the N.U.S.S.

Patch Ideas · 3

8-voice N.U.S.S. stereo system
Two QXGs plus PoliMATHS and MultiWAVE connected via rear headers make a pre-patched 8-voice stereo system — PoliMATHS drives the gates, MultiWAVE feeds the signal inputs, XPREAD pans all eight voices.
Walkthrough
  1. Power off. Connect the rear N.U.S.S. headers: MultiWAVE signal header → QXG #1 signal header (voices 1–4), then daisy-chain to QXG #2 signal header (voices 5–8).
  2. Connect PoliMATHS control header → QXG #1 control header → QXG #2 control header (per manual's N.U.S.S. diagram).
  3. Power on. Leave all Signal Inputs 1–4 and Control Inputs 1–4 on both QXGs unpatched so the headers stay live.
  4. On both QXGs, press the Vactrol Button ON for vactrol-style decay (good starting point).
  5. Set all eight Control Combo Pots to noon — envelopes from PoliMATHS now open each LPG directly.
  6. Set XPREAD on both QXGs to noon (everything centered) for now.
  7. Patch QXG #1 Left Mix Output → Output L and QXG #1 Right Mix Output → Output R.
  8. Patch QXG #2 Left Mix Output → QXG #1 Left (Mono) Aux Input, and QXG #2 Right Aux Input → QXG #1 Right Aux Input — this folds the second QXG's stereo mix into the first.
  9. Trigger PoliMATHS channels to hear all eight voices summed and panned through QXG #1's Mix outputs.
  10. Turn each QXG's XPREAD slowly CW to spread its four voices left→right across the stereo field.
Signal out QXG #1 Left Mix + Right Mix Output — full 8-voice stereo sum at modular audio level (~±5V).
Listen for A wide 8-voice chord where each PoliMATHS envelope plucks or swells a MultiWAVE voice. Rotate XPREAD for the classic N.U.S.S. stereo fan — voices walk across the stereo field as the envelopes fire.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: QXG, MultiWAVE, PoliMATHS, Output. Signals: 3 audio, 1 cv.QXGMultiWAVEPoliMATHSOutputVactrol: ONXPREAD: noonSignal Inputs 1–4audioControl Inputs 1–4cvLeft Mix OutputaudioRight Mix OutputaudioChannel 1–8 OutputsaudioChannel Outputs 1–8cvLaudioRaudio121. via header (voices 1-4)2. via headeraudiocv
Mono channel in stereo spread
Straight from the manual's tips: patch one channel's individual output into the Left (Mono) Aux input so that voice stays dead-centre while the other three voices fan across the stereo field.
Walkthrough
  1. Patch VCO 1 Out → QXG Signal Input 1. Leave Signal Inputs 2–4 on the N.U.S.S. header (or patch three more voices in).
  2. Patch an envelope or LFO → QXG Control Input 1 so Channel 1's LPG opens.
  3. Do the same for Control Inputs 2–4 so all four channels play.
  4. Set XPREAD panel control to full CW — channels 1–4 now fan from Left to Right.
  5. Patch QXG Channel 1 Output → QXG Left (Mono) Aux Input. This pulls Channel 1 out of the stereo spread and re-enters it equally on both Mix outputs.
  6. Patch QXG Left Mix Output → Output L and QXG Right Mix Output → Output R.
  7. Play the patch: Channel 1 sits in the centre while Channels 2, 3, 4 still spread L→R via XPREAD.
Signal out QXG Left Mix + Right Mix Output — stereo mix where Channel 1 is mono-centred (via Left Aux) and Channels 2–4 are panned by XPREAD. Modular audio level.
Listen for One anchored mono voice (e.g. a bass or lead) with three other voices arcing around it in stereo. Very effective for keeping kick/lead in the middle of a moving multi-voice texture.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: QXG, VCO, QXG (Left, Output. Signals: 4 audio.QXGVCOQXG (LeftOutputXPREAD: CWSignal Inputs 1–4audioChannel Outputs 1–4audioLeft Mix OutputaudioRight Mix OutputaudioOutaudioMono) Aux InputaudioLaudioRaudio121. channel 12. ch1 re-entered as mono centreaudio
CV-controlled stereo panning
An LFO into XPREAD CV auto-pans the whole four-channel cluster back and forth across the stereo field — hands-free stereo motion for a drone or sequenced voicing.
Walkthrough
  1. Patch four audio sources → QXG Signal Inputs 1–4 (or leave them on the N.U.S.S. header).
  2. Patch gates/envelopes → QXG Control Inputs 1–4 so all four LPGs are open (or turn the four Combo Pots CW for always-open).
  3. Set XPREAD panel control to noon — all channels start centred.
  4. Set the XPREAD CV attenuverter to about 2 o'clock (moderate positive depth).
  5. Patch a slow LFO (±5V triangle, ~0.2 Hz) → QXG XPREAD CV input.
  6. Patch QXG Left Mix Output → Output L and QXG Right Mix Output → Output R.
  7. Listen: the XPREAD value now swings from CCW through noon to CW over the LFO's cycle — channels fan out, collapse to mono, then fan out reversed.
  8. Turn the attenuverter CCW past noon to invert the pan direction.
Signal out QXG Left Mix + Right Mix Output — stereo mix whose XPREAD is swept by the LFO. Modular audio level.
Listen for A four-voice bed that breathes wide-to-centre-to-wide (and reverses) in time with the LFO. Great for pads; with a faster LFO (~2 Hz) it becomes an auto-panner.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: QXG, LFO, VCOs, Output. Signals: 3 audio, 1 cv.QXGLFOVCOsOutputXPREAD: noonXPREAD CVcvSignal Inputs 1–4audioLeft Mix OutputaudioRight Mix OutputaudioOutcvOutaudioLaudioRaudio11. animate stereo fieldaudiocv

Behaviors

Low Pass Gate CV → Control Input or Combo Pot

CTRL parameter sets both amplitude and frequency of the passing signal simultaneously, giving classic LPG behavior. Analog, vactrol-free circuit.

Vactrol Slow Mode Vactrol button ON

Emulates the characteristic slow decay time of a vactrol optical element. Useful for plucked or natural decaying sounds.

Fast Mode Vactrol button OFF

Fast precision response with gentle LPG filtering. Best for quickly-changing functions from PoliMATHS.

Stereo Spread XPREAD control / CV

Routes all four channels across the stereo field. Individual channel outputs, when patched, remove that channel from the stereo Sum.

N.U.S.S. Normalling header connected

Signal and Control input headers allow pre-patched connections from MultiWAVE (signal) and PoliMATHS (control) without front-panel cables.

Controls

CH 1–4 Control Combo Pots 1–4 Panel controls for each LPG circuit. Attenuates signal at Control Input or normalled N.U.S.S. control signals. Acts as panel control when Control Input is unpatched.
CCW=closed · CW=open · Controls both amplitude and filter frequency
Mix XPREAD Panel Control Sets stereo spread for the four LPG channels. Noon=all centered. CW=Ch1 left→Ch4 right. CCW=reversed.
Noon=center · CW: Ch1=L, Ch2=wL, Ch3=wR, Ch4=R · CCW: reversed
Mix XPREAD CV Input attenuverter Bi-polar attenuator for XPREAD CV input.
Bipolar
Global Vactrol Button Selects response mode: ON=Slow vactrol-emulating decay. OFF=Fast precision response with gentle LPG filtering.
ON=slow/vactrol-like · OFF=fast/precise

I/O

IN · 5

  • Signal Inputs 1–4 audio AUDIO
    Signal inputs for the four LPG circuits. Normalled to N.U.S.S. signal input header (MultiWAVE or MultiMod). Patching breaks normalling.
  • Control Inputs 1–4 CV CV
    CV inputs for the four LPG circuits. Normalled to N.U.S.S. control input header (PoliMATHS or MultiMod). Patching breaks normalling.
  • XPREAD CV CV CV
    CV input for XPREAD stereo spread parameter.
  • Left (Mono) Aux Input audio AUDIO
    Stereo aux input L for chaining a second QXG or adding audio to mix. Mono use: patch to L only — appears at both mix outputs.
  • Right Aux Input audio AUDIO
    Stereo aux input R for chaining or adding audio to mix.

OUT · 3

  • Channel Outputs 1–4 audio AUDIO
    Individual LPG outputs. Patching an output removes that channel from the stereo Mix.
  • Left Mix Output audio AUDIO
    Stereo mix L of all channels and Aux inputs per control levels and XPREAD.
  • Right Mix Output audio AUDIO
    Stereo mix R of all channels and Aux inputs per control levels and XPREAD.