Unity Mixer Manual PDF (Arcus Audio)
The Arcus Audio Unity Mixer is a compact, 2hp Eurorack utility with some hidden creative potential due to its dual 3:1 (or single 6:1) summing capability, DC-coupled inputs, and bi-color signal-level LEDs. While it's technically a "utility" module, you can push it into sound design territory, especially when combining audio and CV in unconventional ways.
Technique:
Use the Unity Mixer for aggressive CV and audio mixing to create clipping, transient attacks, and unusual summing distortions.
Patch Ideas:
- Drive the Mixer with Hot Sources: Feed in multiple drum voices, oscillators, or even triggers/gates directly (some modules output "hot" levels that sum into mild distortion). The unity gain may cause internal soft-clipping when summing 3+ strong signals.
- Percussive Transients Layering: Mix a snappy envelope (e.g., Maths EOR out) into an audio-rate oscillator, along with a noise burst. Route the mixed signal straight to a VCA, then to a wavefolder or distortion for even gnarlier impact.
- Sending Negative CV: Flip the polarity on one input source (using an external inverter) and mix with audio – causing subtractive cancellation and asymmetric clipping for "broken" percussive artifacts.
Technique:
Combine multiple LFOs, envelopes, and audio-rate signals (oscillators, even wavetables) into the Unity Mixer, achieving wild, modulated bass movements.
Patch Ideas:
- Multiple LFO Summing for Wobble: Take 3 LFOs at different sync rates, mix them in one group, and patch that output to modulate a filter or VCA opening your bass oscillator. This gives highly complex, rhythmic bass wobbles.
- CV+Audio Modulation: Patch a sub-oscillator, a detuned oscillator, and a negative envelope into the Unity Mixer; this new complex bass audio source can be routed through wave-shaping for those DnB growls or dubstep snarls.
- Bicolor LEDs as Feedback: Use the LEDs to watch for clipping or polarity reversals—push signals into the red for that broken, glitchy sound characteristic of harder genres.
Technique:
Sum multiple slow, undulating LFOs and envelopes (e.g., from Batumi, Zadar, or Maths) to modulate filters, resonators (like Rings or Clouds), or even CV-controlled FX.
Patch Ideas:
- Complex Filter Sweeps: Mix an envelope, a slow sine LFO, and a randomly modulated S&H into one channel. Use this output to sweep a lowpass or bandpass filter on a pad voice—movement becomes rich and unpredictable.
- Ambient Layer Blending: Combine outputs of two or three different drone oscillator voices (e.g., sine, triangle, wavetable pad), shaping their combined amplitude for lush, blurred soundscapes.
- CV Overlap: Modulate two separate effect parameters (e.g., reverb size + filter cutoff) with one summed, evolving CV, creating an organic, spectral shift in the pad textures.