Dreadbox Synthesizers Dreadbox Erebus V3 Semi-Modular Duophonic Analog Synthesizer

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Building upon the success of the Erebus V1 and V2 synthesizers, the Dreadbox Erebus V3 is a desktop semi-modular analog duophonic synthesizer designed for musicians, sound designers, producers, or anyone looking for a compact yet powerful analog instrument with Eurorack compatibility. Several enhancements have been made to V3 including a third oscillator, triple ring modulation, an expanded patchbay with 35 patch points, an analog clock generator, a patchable sample-and-hold circuit, and dedicated envelopes for both the VCF and VCA.

The instrument can create a massive sound via the three oscillators. Oscillator 1 provides a saw or square wave output, while oscillator 2 offers a saw or triangle output. Both offer tune knobs, glide faders, and octave switches (3-octave range). A mix fader allows you to blend between the two. Oscillator 3 provides six waveforms including saw-up, saw-down, pulse wave (with PWM), triangle, sine, and double saw, along with white noise. By default, oscillator 3 tracks the pitch of oscillator 1, but can be forced to track free by inserting a dead-patch into the CV3 patch point, which allows the circuit to double as an LFO (0.01 Hz to 15 kHz).

The multimode filter is a 2-pole state variable circuit with low-pass and high-pass selections. A fader blends between the two modes and when in the center, acts as a notch filter. The resonant filter can self-oscillate and provides a wide pallet of timbres from smooth to aggressive. The first envelope is pre-wired to the filter cutoff, but can be patched to any other circuit via the patchbay. The envelope also offers a loop switch, which effectively allows it to be behave like an LFO that can be shaped with ADS controls. The amplifier envelope is hardwired for convenience. The echo circuit provides a variety of lo-fi, classic delay effects and is capable of generating reverb, chorus, lo-fi echo, tape echo, pitch shift modulations, or a standard delay.

The rear panel offers a 1/4" main output and input for instrument processing. Additionally, there are two MIDI connectors (In, Thru), which function as a well-spec'd MIDI to CV interface, offering note tracking, gate on/off, pitch wheel, and mod wheel. There is a series of dip-switches on the rear panel that allow for some clever programming such as setting MIDI channels, changing from duophonic to unison modes, automatic tuner settings, and Sysex updates. The Dreadbox Erebus V3 includes a 12 VDC power supply.

General Features
  • Analog duophonic synthesizer
  • Three voltage-controlled oscillators (with auto-tuning to prevent drift)
  • Auto tuning function
  • Triple ring modulator
  • Two-pole, state-variable resonant filter with both 12dB/oct low pass (LP), high pass (HP), and notch settings
  • Filter is capable of self-oscillation
  • Dedicated ADSR envelope for VCA
  • Lo-Fi echo/delay effect
  • ADSR envelope for VCF with loop function
  • Loop function acts like ADS shaped LFO
  • White noise generator
  • Up to 4 LFOs (LFO, Filter Envelope, OSC 3, and Clock)
  • Individual patchable VCA
  • Analog clock generator
  • Patchable sample & hold
  • Extensive modulation options with 35 patch points (3.5mm)
  • MIDI In/Thru via 5-pin DIN connectors
  • Main input and output via 1/4" connectors
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