Modular Add-On: Intellijel Rubicon
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About this plugin
Softube's emulation of the Intellijel Rubicon brings Dave Dixon's acclaimed analog VCO design into the Modular environment as a serious workhorse for frequency modulation synthesis. The module's standout feature is its implementation of through-zero FM in both linear and exponential modes, a capability that opens genuine sonic territory beyond what standard VCOs offer. The exponential TZFM mode is particularly notable, marking a rare software implementation of this behavior that allows for musically coherent pitch modulation across extreme frequency ranges.
The architecture itself is straightforward but comprehensive. A high-precision triangle core feeds into twelve primary waveform types, each with dedicated control surfaces. The symmetry control deserves attention; its ability to sweep from normal through inverted waveforms, including zero-hertz operation, provides unconventional modulation possibilities. Suboctave circuitry with -1 and -2 octave outputs responds to FM modulation identically to main signals, expanding harmonic density options. Both soft and hard sync are included, with hard sync offering selectable reset direction, useful for everything from aggressive tonal shaping to LFO applications.
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The Rubicon suits producers and sound designers invested in deep FM exploration and modular patching workflows. It's equally valuable for those seeking character beyond basic digital oscillators, though mastery requires engagement with its FM capabilities rather than simple preset usage. Within Softube's Modular ecosystem, the Rubicon functions as a primary oscillator for complex synthesis tasks, standing alongside traditional options but with distinctly expanded frequency modulation vocabulary.