winterbloom-castor-and-pollux-ii

Winterbloom Castor & Pollux II

Dual Juno-style DCO with chorus, hard sync, and an internal LFO

14 HP Eurorack module

Castor & Pollux II is a dual Juno-inspired voice built from two digitally controlled analog oscillators, each a modernized version of the Roland Juno 106 DCO. Every oscillator generates ramp, pulse, and sub waveshapes with onboard mixers, plus pulse-width control. The two oscillators are deeply intertwined: Pollux can follow and detune against Castor, and an internal LFO drives four modes - chorus, LFO PWM, LFO FM, and hard sync - selected with a single button. A crossfade mixer blends the pair into one combined output.

Features

  • Two independent analog DCOs modeled on the Roland Juno 106
  • Seven-octave pitch range with 1 V/octave tracking
  • Three waveshapes per oscillator - ramp, pulse, and sub - with onboard mixers
  • Pulse-width control and CV input for each oscillator
  • Pollux follows Castor when its pitch CV is unpatched, for easy detuning and stacking
  • Coarse, Fine, and Multiply pitch behaviors selected automatically by jack detection
  • Internal LFO with switchable triangle, sine, sawtooth, or square shapes
  • Chorus mode recreates the classic Juno analog chorus
  • LFO PWM and LFO FM modes for pulse-width and frequency modulation of both oscillators
  • Hard sync mode for metallic, harmonically rich timbres
  • Crossfade mixer blends the two oscillators into one combined output
  • Tweak overlay adds extra-fine tuning and LFO rate control on the existing knobs

Controls & Jacks (21)

  • Castor Pulse Width
  • Pollux Pitch
  • Pollux Pulse Width
  • LFO
  • Crossfade
  • Pollux Pitch CV In
  • Castor Pitch
  • Castor Sub Mix
  • Castor Pitch CV In
  • Castor Pulse Mix
  • Pollux Pulse Mix
  • Castor Output
  • Castor Pulse Width CV In
  • Pollux Pulse Width CV In
  • Pollux Ramp Mix
  • Crossfade Output
  • Castor Ramp Mix
  • Pollux Output
  • Mode
  • Pollux Sub Mix
  • Mode LED

How-To Guides

  • Classic Juno bass
  • Detuned two-oscillator stack
  • Juno-style chorus pad
  • Hard sync lead
  • LFO pulse-width motion

Explore the interactive Castor & Pollux II panel on BleepDex — tap any control to learn what it does.

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