2.7. RhythmWeight: Algorithmic Weighted Random Rhythm Generator

2.7.1. Documentation

This tool allows the creation of polyrhythms using weighted randomness. The tool interface permits the creation of Parts A through E. Each Part may consist of up to eight rhythms. Rhythms are selected at random based on their weight, where larger weights are more likely to be selected. Each Part has an independent BPM tempo, GM MIDI instrument, and (if applicable) pitch.

The rhythm sequence of each Texture is composed with a vertical column of pop-up menus. Rhythms are configured as a sequence of pulse triples. A pulse triple, occupying each row of pop-up menus, permits the selection of a divisor (division of the BPM-specified tempo), a multiplier (scalar of the divided pulse), and an accent.

Accent values are notated as dynamic markings (loudness measures): the range (pp, p, mp, mf, f, ff), from soft to loud, is provided. An off symbol (o) designates a rest (measured silence). An on symbol (+) designates a maximum value.

Sequences can employ different algorithmic selectors. Algorithmic selectors may choose values from the specified sequence length based on the specified procedure. Procedures include orderedCyclic (in-sequence loops), orderedOscillate (in sequence back and forth loops), randomChoice (equal-distribution random selection), randomPermutate (random re-orderings of the entire sequence), and randomWalk (random movements in single steps up or down the sequence lengths).

Each Texture may have an independent tempo (as entered in the box labeled "bpm"), and an independent GM MIDI instrument (as entered in the box labeled "inst"). The pitch parameter (as entered in the box labeled "pitch") is only applied to non-percussion instruments.

The sequence length (labeled "rhythm length" and/or "tune length") determines how many of the vertical column of pop-up menu items are used and selected. This setting determines which rhythms or pitches are used, regardless of how they are specifically configured.

2.7.2. Interface Components

This tool employs the following interface components: Beats Per Minute Input (Section 3.2), Output Duration Selector (Section 3.8), Output Format Selector (Section 3.9), Pitch Selector (Section 3.10), Pulse Triple Selector (Section 3.11), Algorithmic Selector (Section 3.12), and Weight Selector (Section 3.15)