hieroglyphic-opalina

Hieroglyphic Opalina

Stereo triple-band Resonator and Isolator filter

14 HP Eurorack module

A DC-coupled stereo three-band filter and VCA module with Resonator and Isolator operating modes.

Features

  • Stereo or dual-mono main inputs with shared filter controls.
  • Separate low, mid, and high outputs plus a summed output.
  • Compatible with the OPX expander for individual input pairs per filter band.

Controls & Jacks (26)

  • Low Level CV Input— DC-coupled CV input summed with the Low Level slider before the low-band VCA.
  • Mid L Output— DC-coupled left-channel output of the mid filter band.
  • Mode— Toggles between Resonator and Isolator operating modes.
  • High Level CV Input— DC-coupled CV input summed with the High Level slider before the high-band VCA.
  • R Input— DC-coupled right main input sent to all three filter bands; when only this input is patched, the left outputs have no signal.
  • Reso CV Input— DC-coupled CV input summed with the Reso slider.
  • Sum R Output— DC-coupled right-channel mix output of the three bands; soft clips at approximately ±9 V.
  • High L Output— DC-coupled left-channel output of the high filter band.
  • L Input— DC-coupled left main input sent to all three filter bands; normalled to the right input when R is unpatched.
  • Low L Output— DC-coupled left-channel output of the low filter band.
  • FM Input— DC-coupled FM CV input affecting the frequency of all three filter bands.
  • Span CV Input— DC-coupled CV input summed with the Span slider.
  • Mid Level CV Input— DC-coupled CV input summed with the Mid Level slider before the mid-band VCA.
  • Mid R Output— DC-coupled right-channel output of the mid filter band.
  • Sum L Output— DC-coupled left-channel mix output of the three bands; soft clips at approximately ±9 V.
  • Low R Output— DC-coupled right-channel output of the low filter band.
  • High R Output— DC-coupled right-channel output of the high filter band.
  • Frequency— Sets the mid output centre frequency, approximately 30 Hz to 15 kHz before CV and Span modulation.
  • Mid Level— Sets the exponential pre-filter VCA level for the mid band and its contribution to Sum.
  • High Level— Sets the exponential pre-filter VCA level for the high band and its contribution to Sum.
  • Reso— Sets cutoff peaking (Q) for all three filter bands.
  • Span— Sets band spacing around the mid band in Resonator mode, or the mid-band bandwidth and associated low/high cutoffs in Isolator mode.
  • FM Amount— Attenuverter for the FM input; fully positive extension enables V/Oct keyboard tracking.
  • Low Level— Sets the exponential pre-filter VCA level for the low band and its contribution to Sum.
  • Resonator Mode Indicator— Orange indicator showing that Resonator mode is selected.
  • Isolator Mode Indicator— Blue indicator showing that Isolator mode is selected.

How-To Guides

  • Use one source for both channels

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

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