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Winterbloom Castor & Pollux Dual Juno-style VCO

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Castor & Pollux is a Roland Juno-inspired oscillator. It contains two digitally-controlled analog oscillators implemented using a faithfully modernized version of the original Juno 106 design. Like its inspiration, it can give you that wonderful ‘80s sound with independent and mixed ramp, pulse, and sub outputs. But the twins do not stop there- the second oscillator can be used to layer in thick detuned sounds, harmonically complex hard synced waveforms, or as a fully independent second voice.

The cherry on top is the internal LFO that can apply subtle pitch shifting to the second oscillator. This gives a sound that echos back to the Juno’s legendary chorus while giving the module its own unique voice.



  • 14hp

  • Two separate oscillators with a 7 octave range

  • A flexible set of outputs (9 total):

    • Separate ramp, pulse, and sub outputs for each oscillator

    • Each oscillator has its own mixer to combine the ramp, pulse, and sub waveforms into a single output

    • A combined output with a cross-fade mixer

  • Pitch CV in (0v to 6v) and pitch offset knobs (-1 oct to +1 oct) for each oscillator - the pitch offset knobs have a non-linear response which makes it easier to tune the oscillators.

  • Pulse-width CV in and knob for each oscillator

  • Hard sync mode that syncs the second oscillator to the first

  • Built-in low-frequency oscillator (LFO) that can be used to modulate the pitch of the second oscillator. It can also be used to provide pulse-width modulation to both oscillators.

  • +12v 100mA¹, -12v 35mA, 25mm deep

  • 100% open source hardware, firmware, and software

_hp 14