Omnitone — Rosci

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Rosci User Manual PDF

Making Hyper-Complex Percussion With Rosci (Eurorack)

The Rosci module, as described in the manual, is a highly flexible digital oscillator designed to excel at customized waveform generation. Its ability to morph between shapes, interpolate, and introduce nonlinearities makes it perfect for unusual, percussive, and detailed rhythmic material, especially when you combine it with external rhythmic modulation sources.

Below is a detailed strategy for achieving densely rhythmic, polyrhythmic, and highly complex percussion sequences using Rosci, along with tips for maximizing its uniqueness and punch.

1. Use Rosci As a Percussive Voice

Set Up Rosci as a Drum Voice:

• Mode: Keep Rosci in VCO mode for metallic digital drums; flip to LFO mode for slow, generative CV percussive triggers.
• Waveform Complexity: Use the Generate and Complexity parameters to craft transient-rich, short, inharmonic wave shapes. Try 2-6 points for clicky, snappy percussive attacks; add harmonics for metallic noise.
• Roundness and Formants: Experiment with these to mimic physical, vocal, or organic drum-like timbres.
• Detune: Detune for percussive clashing overtones.

2. External Rhythmic Control for Polyrhythms

Triggering & Sequencing:

• Trigger Input: Patch different trigger/gate streams (e.g., from Euclidean, polyrhythmic, or random step sequencers) into Rosci's trigger input.
  • Each distinct trigger pattern can activate Rosci at off-grid, overlapping rhythms for polyrhythms or odd time signatures.
• V/OCT Input as Pattern Parameter: Sequence Rosci with shared or independent melodic or non-traditional pitch patterns (e.g., microtonal, odd scales) for further rhythmic variation.

3. Modulate the Sound for Variation

Assuming you have several modulation sources (LFOs, random generators, sequencers):

• CV Inputs: Patch rhythmic CV sources into Complexity, Harmonics, Formants, and Detune.
  • E.g., send clock-divided or probability-skipping gates into Harmonics/Complexity for per-step timbral changes that sync or desync with Rosci’s triggers.
• Envelope & Random: Patch fast, percussive envelopes or stepped random voltages (e.g., sample-and-hold based on polyrhythmic triggers) to Roundness or Formants for morphing attacks/sustains.
• Morphing & Interpolation: Switch interpolation methods mid-sequence for jumps between sharp and smooth transitions—emphasize punchy vs. clicky textures.

4. Patch Ideas for Complex Rhythms

• Multi-Trigger Input: Combine several gate patterns with a logic module (OR, XOR) to drive Rosci's trigger input for interlaced, complex rhythms.
• FM/AM: Use an audio-rate VCO or fast envelope to modulate the pitch (V/OCT) input for “FM drum” or clangorous bell sounds, or modulate parameters for constantly changing attacks.
• Manual Play: Tap out triggers live for fills, then automate them for evolving patterns.

5. Unique Percussive Effects

• CV-Controlled Switching: Use a sequencer to rhythmically switch/interpolate Rosci's parameters in extreme ways, turning each trigger into a seemingly new drum/click sound.
• Formant Compression: Set Formants and Harmonics to extremes for "vocal percussion"—Kabuki or robotic-sounding hits.
• Max Detune: Sweep Detune with random or sneaky slow LFOs to create moving, phasey percussive ripples.

6. Combine With Effects

• Resample: Route Rosci to a granular or delay module and re-trigger with polyrhythmic gates.
• Ring Mod/Distortion: Feed output into analog ring modulation or distortion for raw, accentuated texture.

Summary Table

Tips:
- Use different, unsynchronized modulation clocks for each parameter control. - Feed Rosci’s output to a VCA controlled by rhythmic envelopes for even more articulation. - Resample or layer Rosci with other drum modules for hyper-complex grooves.

Rosci User Manual PDF
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