instruo-carn

Instruo Carn

Four-channel utility mixer with panning, VCA, ring mod, and crossfade

8 HP Eurorack module

Carn is an Instruo 4-channel stereo performance mixer in 8HP. Each channel has a unique topology: Ch1 is a simple attenuator, Ch2 is a two-quadrant VCA, Ch3 is a four-quadrant VCA, and Ch4 is a crossfader. All channels have individual pan controls and mono outputs, summing to a stereo bus with a soft-clipping limiter.

Features

  • Four independent utility channels with individual mono outputs
  • Channel 1: Voltage-controlled constant power panner with equal loudness contours, audio-rate capable
  • Channel 2: Two-quadrant linear VCA with normalled +6V reference for use without CV
  • Channel 3: Four-quadrant VCA (ring modulator) with bipolar/unipolar polarity switch
  • Channel 4: Linear crossfader between two input signals
  • All four channels feed a summing stereo bus with individual pan controls
  • Master stereo VCA with Level knob and bipolar CV input with attenuator
  • Optional stereo analogue diode-based soft clipping limiter on stereo bus
  • Per-channel normalling switches: Half Normalled or Normalled (back panel)
  • Per-channel AC/DC coupling switches for audio or CV mixing (back panel)
  • Stereo Input Back Jack and Stereo Output Back Jack for chaining modules
  • Compatible with Instruō cuïr and other compatible Instruō stereo expansion modules

Controls & Jacks (31)

  • Level CV Input— Bipolar control voltage input for Level parameter. Sums with Level knob and scaled by Level CV Attenuator
  • Level— Determines the amplitude of the Stereo Outputs. Clockwise increases amplitude
  • Level CV Attenuator— Determines the depth of external CV modulation applied to the Level parameter
  • Stereo Output Right— Right channel of summed stereo outputs (post fader, post pan) of all four channels
  • Stereo Output Left— Left channel of summed stereo outputs (post fader, post pan) of all four channels
  • Channel 1 Primary Input— Signal input for Channel 1 attenuator and mixer channel to stereo output
  • Channel 1 Mono Output— Individual mono output for Channel 1 (post fader, pre pan)
  • Channel 1 Pan CV Input— Bipolar control voltage input for Channel 1 pan parameter. Sums with knob position
  • Channel 1 Pan— Pan knob for Channel 1 with constant power panning. Sums with CV input
  • Channel 1— Scales the signal present at Channel 1 Primary Input with audio taper response curve
  • Channel 3 Primary Input— Carrier signal input for Channel 3 four-quadrant VCA and mixer channel
  • Channel 3 Secondary Input— Bipolar modulator input for Channel 3 VCA. Sums with fader position
  • Channel 3 Mono Output— Individual mono output for Channel 3 (post fader, pre pan)
  • Channel 3 Pan— Pan knob for Channel 3 with constant power panning
  • Channel 3— Produces unipolar positive or bipolar offset that sums with Channel 3 Secondary Input signal. Audio taper response curve
  • Channel 2 Primary Input— Carrier signal input for Channel 2 two-quadrant VCA and mixer channel
  • Channel 2 Secondary Input— Unipolar positive modulator input for Channel 2 VCA. Normalled to +6V reference if not patched
  • Channel 2 Mono Output— Individual mono output for Channel 2 (post fader, pre pan)
  • Channel 2 Pan— Pan knob for Channel 2 with constant power panning
  • Channel 2— Scales the signal present at Channel 2 Secondary Input with audio taper response curve
  • Channel 4 Primary Input— Primary signal input for Channel 4 crossfader and mixer channel
  • Channel 4 Secondary Input— Secondary signal input which crossfades with Channel 4 Primary Input
  • Channel 4 Mono Output— Individual mono output for Channel 4 (post fader, pre pan)
  • Channel 4 Pan— Pan knob for Channel 4 with constant power panning
  • Channel 4— Crossfades between signals present at Channel 4 Primary and Secondary Inputs. Linear taper response curve
  • Channel 3 Polarity— Changes Channel 3 Fader range between bipolar and unipolar positive
  • Limiter— Engages or disengages global stereo soft clipping limiter on Stereo Outputs
  • Normalling Switches— Four dip switches on back, one per channel. Controls whether Mono Output breaks or maintains Stereo Output connection
  • AC/DC Coupling Switches— Four dip switches on back, one per channel. Sets AC or DC coupling per channel
  • Stereo Input Back— External stereo input on back panel for expansion with related Instruo modules. 100K ohm impedance, sums at unity gain
  • Stereo Output Back— External stereo output on back panel for expansion with related Instruo modules

How-To Guides

  • Slow Stereo Autopan with LFO
  • Classic Envelope-Controlled VCA
  • Ring Modulation — Metallic Timbres
  • Smooth Crossfade Between Two Sources
  • Four-Channel Stereo Audio Submixer
  • Four-Source Control Voltage Mixer
  • Analogue Bus Saturation and Limiting
  • Audio Rate Pan Modulation for Timbral Effects
  • Chaining Two càrn Modules via Back Jacks
  • Unbalanced Amplitude Modulation

Explore the interactive Carn panel on BleepDex — tap any control to learn what it does.

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