Quadratt 1U

Intellijel 28HP
ATTENUATOR ATTENUVERTER MIXER UTILITY

Verified sheet

The facts on this sheet have been cross-checked against the sources below.

Sources
Suggest a correction

Quad attenuator, attenuverter, mixer, and DC source. Four channels cascade left to right, with each input normalled to +5V for offsets, submixes, and macro CV.

Patch Ideas · 4

Macro CV bank
LFO to filter cutoff · envelope to VCA CV · two spare channels as DC offsets · one panel handles trim, inversion, and a clean offset source for four destinations.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 2 audio, 4 cv.Quadratt 1ULFOEnvelopeFilterVCAVCOOutputIN A: normalled +5VIN B: normalled +5VIN C: normalled +5VIN D: normalled +5VIN AcvIN BcvOUT AcvOUT BcvOutcvOutcvInaudioCutoffcvCVcvOutaudioOutaudioInaudioaudiocv
Stereo trim
Two voices into channels A and B · use OUT A and OUT B as independent trim controls before the mixer · polarity switch on B inverts one side for phase experiments or mid/side style patches.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 6 connections. Modules: Quadratt 1U, VCO 1, VCO 2, Mixer, Output. Signals: 6 audio.Quadratt 1UVCO 1VCO 2MixerOutputIN A: channel A audioIN B: channel B audioIN C: normalled +5VIN D: normalled +5VIN AaudioIN BaudioOUT AaudioOUT BaudioOutaudioOutaudioLaudioRaudioOut LaudioOut RaudioLaudioRaudioaudio
Bipolar filter sweep
LFO into a bipolar channel and a fixed +5V offset into the next one · OUT C sums the two into a controllable cutoff sweep that can sit above or below center without a separate offset module.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 5 connections. Modules: Quadratt 1U, LFO, Filter, VCO, Output. Signals: 2 audio, 3 cv.Quadratt 1ULFOFilterVCOOutputIN A: bipolarIN B: unpatchedIN C: normalled +5VIN D: normalled +5VIN AcvIN BcvOUT AcvOUT CcvOutcvInaudioCutoffcvOutaudioOutaudioInaudioaudiocv
Four-way voltage fanout
A sequencer pitch CV fans out to four oscillators with zero re-patching · each channel trims one copy for stacked unison, octave drift, or tiny detune offsets.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Quadratt 1U, Sequencer, VCO 1, VCO 2, VCO 3, VCO 4. Signals: 5 pitch.Quadratt 1USequencerVCO 1VCO 2VCO 3VCO 4IN A: pitch busIN B: pitch busIN C: pitch busIN D: pitch busIN A1v/octOUT A1v/octOUT B1v/octOUT C1v/octOUT D1v/octPitch1v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octpitch

Behaviors

Precision offset source leave an input unpatched

Each channel receives a normalized +5V reference, so the knob can output a clean DC offset without any external source.

Cascaded mixing leave earlier outputs unpatched

The outputs form a left-to-right summing bus. OUT B can be A+B, OUT C can be A+B+C, and OUT D can become the full four-channel mix.

Bipolar modulation switch a channel to bipolar mode

The channel becomes an attenuverter, so the same knob can invert, center, or scale a CV instead of only trimming it.

Four-knob macro bank patch multiple destinations from the four outputs

One panel can drive several destinations with matched offsets or related but independent CV amounts.

Controls

A-D Channel Knob A-D Scales or offsets each channel's incoming signal or normalled DC source.
Unipolar: 0V to +5V · Bipolar: -5V to +5V
A-D Mode Switch A-D Selects attenuator or attenuverter mode for each channel.
Up = unipolar · Down = bipolar

I/O

IN · 4

  • IN A +5V normalled AUDIO
    Channel A signal input. Normalled to a precision +5V source when unpatched.
    NORM → precision +5V DC source
  • IN B +5V normalled AUDIO
    Channel B signal input. Normalled to a precision +5V source when unpatched.
    NORM → precision +5V DC source
  • IN C +5V normalled AUDIO
    Channel C signal input. Normalled to a precision +5V source when unpatched.
    NORM → precision +5V DC source
  • IN D +5V normalled AUDIO
    Channel D signal input. Normalled to a precision +5V source when unpatched.
    NORM → precision +5V DC source

OUT · 4

  • OUT A
    Channel A output. When unpatched, acts as the first stage of the cascade.
  • OUT B
    Channel B output. With OUT A empty, it sums channels A and B.
  • OUT C
    Channel C output. With OUT A and OUT B empty, it sums channels A, B, and C.
  • OUT D
    Channel D output. With OUT A, OUT B, and OUT C empty, it sums all four channels.