Michael Winter
737f1e4886
- Implement DCA (Dissonant Counterpoint Algorithm) to favor voice changes - Track actual pitch changes in voice_stay_count (not graph indices) - Add CLI weight arguments: --weight-melodic, --weight-contrary-motion, --weight-hamiltonian, --weight-dca, --weight-target-range - DCA probability = (sum of stay_counts for changing voices) / (sum of all) - Test with --weight-dca 100 shows frequent voice changes
90 lines
3.1 KiB
Markdown
90 lines
3.1 KiB
Markdown
# Compact Sets
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A rational theory of harmony based on Michael Winter's theory of conjunct connected sets in harmonic space, combining ideas from Tom Johnson, James Tenney, and Larry Polansky.
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## Installation
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```bash
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# Activate virtual environment
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source venv/bin/activate
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# Run
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python -m src.io --dims 4 --chord-size 3
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```
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## CLI Options
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### Graph Parameters
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- `--dims 4|5|7|8` - Number of prime dimensions (default: 7)
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- `--chord-size 3|4` - Size of chords (default: 3)
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- `--max-path` - Maximum path length (default: 50)
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- `--symdiff-min`, `--symdiff-max` - Symmetric difference range (default: 2-2)
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- `--seed` - Random seed (default: random)
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- `--cache-dir` - Graph cache directory (default: ./cache)
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- `--output-dir` - Output directory (default: output)
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- `--rebuild-cache` - Force rebuild graph
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- `--no-cache` - Disable caching
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### Voice Leading Constraints (Hard Factors)
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These factors eliminate edges that don't meet the criteria.
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- `--voice-crossing` - Allow edges where voices cross (default: rejected)
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- `--direct-tuning` - Require edges to be directly tunable (default: enabled)
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### Voice Leading Weights (Soft Factors)
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These factors weigh edges without eliminating them. Set weight to 0 to disable.
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- `--weight-melodic` - Weight for melodic threshold (default: 1)
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- `--weight-contrary-motion` - Weight for contrary motion (default: 0)
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- `--weight-hamiltonian` - Weight for Hamiltonian path (default: 1)
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- `--weight-dca` - Weight for DCA
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- `--weight-target-range` - Weight for target register range (default: 1)
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### Target Range
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- `--target-range` - Target range in octaves for rising register (default: disabled)
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- When set, enables target_range factor with weight 1
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- Use `--weight-target-range` to adjust the weight
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## Weight Factor Details
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### Hard Factors (Eliminate edges)
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- **Direct tuning**: If enabled, eliminates edges that are not directly tunable
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- **Voice crossing**: If not allowed (default), eliminates edges with voice crossing
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### Soft Factors (Weigh edges)
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- **Melodic threshold**: Penalizes edges with voice movements outside the melodic range
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- **Contrary motion**: Boosts edges where some voices move up and others move down
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- **Hamiltonian**: Penalizes edges that revisit nodes already in the path
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- **DCA**: Boosts edges where voices change/move (rather than staying)
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- **Target range**: Boosts edges that move toward the target register
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## Examples
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```bash
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# Basic usage
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python -m src.io
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# Rising register to 2 octaves
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python -m src.io --target-range 2
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# Heavy target range, no DCA
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python -m src.io --target-range 2 --weight-target-range 10 --weight-dca 0
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# Disable Hamiltonian (allow revisiting nodes)
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python -m src.io --weight-hamiltonian 0
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# Enable voice crossing
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python -m src.io --voice-crossing
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```
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## Legacy
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The `legacy/` folder contains earlier versions of this code, used to create the musical works published at [unboundedpress.org/works/compact_sets_1_3](https://unboundedpress.org/works/compact_sets_1_3).
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## Output
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Generated files go to `output/`:
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- `output_chords.json` - Chord data
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- `output_chords.txt` - Human-readable chords
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- `output_frequencies.txt` - Frequencies in Hz
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