Rare WavesHydronium Semi-Modular Bass Voice (Silver)


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Rare Waves Hydronium

The Hydronium is a semi-modular bass synthesizer voice, great for leads, bass lines, or even percussive synthesis. It's great for acid basslines, with a classic squelchy filter—but it also carries its own unique, snarling voice great for a huge range of sounds.

The Hydronium's VCO has both saw and pulse waveforms with PWM control and CV input. The pitch can be adjusted in semitones with the fine tune knob and octaves with the coarse tune trimmer. The coarse tune is more of a set and forget control, while the fine tune control is great for making small tuning adjustments. The MIDI input acts as a MIDI to CV converter and features trigger, velocity, and pitch outputs. These outputs can be used to sequence external oscillators in tandem with the Hydronium—quite useful, as bringing another oscillator into the mix input allows for a more harmonically complex sound. The CV and MIDI inputs can be used together to offset and transpose sequences.

The VCF is an OTA-based -12dB/oct state variable filter with cutoff control and resonance that goes into self oscillation. With high resonance settings, a short pulse at the audio input will result in a short percussive sine wave tone, great for synthesizing drum tones such as kick drums.

Hydronium features a decay-only envelope with two modes, triggered and gated. In triggered mode, a trigger, gate, or MIDI note of any length will cause the envelope to immediately fire and then decay at a rate set by the decay knob and decay CV input. In the gated mode, the length of the incoming gate signal or MIDI note affects the envelope, with the envelope held high during the duration of the gate or note, and then decaying when it turns off. When using the MIDI input in triggered mode, the envelope can be retriggered with overlapping notes with velocities of 100 or over. In addition to the VCA, the envelope is also routed to the filter through the filter envelope knob, which sets the amount of modulation. When using the MIDI input, notes with MIDI velocities from 101–127 engage the accent. The bipolar dynamics control sets the amplitude of the accented notes and can even be inverted so accented notes are quieter than standard notes. Gate signals are always treated as accented notes, but the velocity CV input can be used to vary the amplitude dynamically.

Glide or portamento can be added for sliding between notes. There are two modes, full glide and legato. Full glide will add glide to every note, while in legato mode, only notes that overlap will be affected. When using a CV sequence, this occurs when the CV note changes during a single gate input. When using MIDI, overlapping MIDI notes will engage the glide. The glide rate is set by the glide knob and CV input. With the glide knob all the way down in either mode, no glide will be added to the sequences. An FX loop allows external effects to be inserted into the signal path. Distortion, fuzz, or phasing effects work great for adding another layer of tonal variation to your sound. The FX loop is post filter but pre-VCA, so noisy effects won't bleed through when the Hydronium isn't actively playing notes.

With integrated MIDI to CV, great sounding filter, and FX loop, the Hydronium isn't your standard Eurorack bass voice.

Hydronium Features

  • Bass voice
  • Integrated MIDI to CV converter
  • VCO with pulse and saw waves
  • OTA-based filter that goes to self oscillation
  • External audio inputs
  • Dynamic accent control
  • Glide with two modes
  • Decay envelope with two modes
  • FX loop
  • Eurorack module
  • Width: 28hp
  • Depth: 26mm
  • Current draw: 50mA @ +12V, 5mA @ -12V
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