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Softube Intellijel Rubicon
Add-On for Modular Virtual Synth System


The thru-zero frequency modulation of the Softube Intellijel Rubicon makes it great for FM synthesis experimenation.
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Softube Intellijel Rubicon

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The thru-zero frequency modulation of the Softube Intellijel Rubicon makes it great for FM synthesis experimenation. Rubicon is an analog VCO design masterpiece originally engineered by Dave Dixon at Intellijel. At one time a unique Eurorack module, it's now offered as an add-on module for Softube's Modular virtual synth system (sold separately). An analog triangle core VCO that is capable of thru-zero frequency modulation, and is feature-packed, with multiple simultaneous waveform outputs, including waves that are multiples or divisions of the base frequency.

Softube Intellijel Rubicon Features:

  • High precision emulated Triangle core
  • Switchable linear and (for the first time in any module) exponential TZFM (through-zero FM)
  • Linear index VCA for dynamic control of TZFM depth
  • Symmetry control (full clockwise is normal, full counter-clockwise gives reversed waveforms, centered the VCO is at 0 Hz) with CV
  • 12 primary waveform types: sine, sigmoid, double sigmoid, triangle, saw, double saw, zigzag, square, pulse (center modulated), pulse (edge modulated), double pulse
  • Suboctave circuit with -1 and -2 octaves. The suboctave output is affected by fm just like the main signals
  • Soft sync (also known as reversing sync) with attenuator
  • Hard sync with selectable reset direction (determines if the triangle starts moving up or down after a reset, very useful in LFO mode)
  • Pulse-width modulation and exponential FM with dedicated attenuators
  • Requires Softube's Modular (sold separately)

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