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◆ ◇ ◆ ◇ ◆ EXCERPT · src/harmony/voice_leading/style_rules.rs

/// Style-rule preset: Palestrina (strict 16th-c. species).
/// Hard rules: reject parallel 5ths + 8ves, max leap = perfect 4th.
/// Soft weights: stepwise motion rewarded, leaps penalized, common-
/// tones preferred, contrary motion bonused.
pub const PALESTRINA: StyleRules = StyleRules {
    reject_parallel_fifths:  true,
    reject_parallel_octaves: true,
    max_leap_semitones:      5,
    stepwise_bonus:         60,
    common_tone_bonus:      45,
    leap_penalty_per_semi: -15,
    voice_cross_penalty: -150,
    spread_preference:      -4,
    contrary_motion_bonus:  40,
};