drumgen

Flues DrumGen

DrumGen is a transport-synced LV2 MIDI drum-pattern generator. It is designed to pair cleanly with lv2/drumkit, defaulting to MIDI channel 10 and the drumkit note layout.

Current implementation status:

• host time:Position sync
• polyphonic MIDI drum note generation
• genre-biased lane templates with Euclidean variation
• explicit fill motifs layered onto the last bar
• modular DSP internals split into pattern, variation, transport, and state helpers
• exact pattern persistence through LV2 State
• X11/Cairo UI with core controls, action buttons, and grid preview
• Flues Drumkit and GM note-map presets
• loop-aware Vary control for gradual pattern evolution

Build

cd lv2/drumgen
cmake -S . -B build
cmake --build build
cmake --install build --prefix ~/.lv2

From the repo root:

./install-drumgen.sh

Controls

• Selectors: Genre, Channel, Kit Map, Bars, Resolution
• Feel: Density, Variation, Fill, Vary, Seed
• Lane Macros: Kick, Backbeat, Hat, Tom, Metal, Perc
• Actions:
  • New regenerates the full pattern
  • Mutate rerolls the pattern with the current feel settings
  • Fill refreshes the last bar more aggressively
• Variation still controls within-pattern rhythmic complexity and Euclidean looseness.
• Vary runs from 0-100% and mutates the pattern across repeated loops: low values make small bar-scale nudges every several bars, while 100% fully regenerates every loop.

Default DrumKit Mapping

• Kick 36
• Clap 39
• Snare 40
• Crash 41
• Closed Hat 42
• Low Tom 45
• Open Hat 46
• High Tom 50
• Bash 51
• Cowbell 52
• Clave 53