Pitch Morphing Between Targets — User Guide
Dynamic pitch navigation: creates smooth transitions between user-defined pitch targets with elastic interpolation, tension effects, and expressive articulation.
What this does
This script implements pitch morphing between targets — an advanced pitch manipulation technique that creates smooth, expressive transitions between user-defined pitch destinations. Generates sophisticated pitch contours using elastic interpolation algorithms, tension-based dynamics, and articulated transitions that respond to the musical distance between targets. Process navigates through a sequence of pitch waypoints with intelligent curve shaping and expressive articulation.
Key Features:
- 8 Morphing Presets — From gentle waves to chaotic dances
- Target Sequence Definition — User-specified pitch waypoints
- Elastic Interpolation — Smooth transitions with configurable curves
- Overshoot Effects — Natural-sounding pitch anticipation
- Tension Dynamics — Pitch distance-responsive intensity
- Articulated Vibrato — Context-aware ornamentation
What is pitch morphing between targets? Traditional pitch effects: fixed patterns, random variations. Target morphing: intentional navigation through defined pitch destinations with intelligent transition shaping. Advantages: (1) Intentional design: Precise control over pitch destinations and paths. (2) Expressive transitions: Natural-sounding movement between targets. (3) Dynamic response: Transitions adapt to musical context. (4) Musical phrasing: Creates coherent pitch narratives. (5) Flexible articulation: Different transition characters for different contexts. Use cases: Expressive vocal processing, melodic contour design, experimental composition, sound design narratives, algorithmic melody generation.
Quick start
- Select Sound object in Praat
- Run
pitch_morphing_targets.praat - Choose preset for pre-configured target sequences
- Or define custom target_pitches (e.g., "0_12_-8_15")
- Adjust morph_smoothness (0.8-2.5) for transition curves
- Set overshoot_factor (0.1-0.8) for elastic anticipation
- Configure tension_strength (0.05-0.4) for dynamic intensity
- Click OK — pitch morphing applied
Quick tip: Start with Emotional Arcs for expressive vocal phrasing, Chromatic Walk for melodic sequences, or Dramatic Leaps for intense pitch jumps. Each preset creates distinct musical narratives through target sequencing.
Morphing Theory
Target Sequence System
🎯 Pitch Target Syntax
Target format: Underscore-separated semitone values
Syntax: "0_12_-8_15_-12_20_5_-5"
Where:
Numbers = Semitone offsets from original pitch
Positive = Pitch up (e.g., 12 = octave up)
Negative = Pitch down (e.g., -12 = octave down)
Decimal = Microtonal values (e.g., 1.5 = quarter-tone up)
Examples:
"0_7_12" = Upward major seventh to octave
"0_-5_3_-8" = Expressive minor key contour
"0_2_4_5_7_9_11_12" = Chromatic ascent
"0_1.5_-1_2.5" = Microtonal exploration
Interpretation:
Targets are evenly distributed across audio duration
Script creates smooth transitions between each pair
First target = starting point, last target = ending point
Elastic Interpolation Algorithm
🔄 Advanced Transition Curves
Three-component interpolation system:
# Basic smooth interpolation
elastic_curve = fraction^smoothness / (fraction^smoothness + (1 - fraction)^smoothness)
# Elastic overshoot effect
overshoot = overshoot_factor * sin(fraction * π) * (1 - fraction) * fraction
# Combined interpolation
smooth_fraction = elastic_curve + overshoot
# Final pitch calculation
interpolated_pitch = pitch_low + smooth_fraction * (pitch_high - pitch_low)
Where:
fraction = Normalized position between targets (0 to 1)
smoothness = Controls transition curvature (0.8-2.5)
overshoot_factor = Controls anticipation effect (0.1-0.8)
Tension and Articulation System
| Component | Function | Effect |
|---|---|---|
| Distance Tension | Dynamic intensity | Larger intervals = more expressive variation |
| Elastic Overshoot | Anticipation | Natural-sounding pitch anticipation before targets |
| Contextual Vibrato | Articulation | Vibrato intensity peaks during transitions |
| Smoothness Control | Transition character | Higher = gradual curves, Lower = direct paths |
Parameter Interactions
morph_smoothness (0.8-2.5):
Low (0.8-1.2): Direct, energetic transitions
Medium (1.2-1.8): Balanced, musical curves
High (1.8-2.5): Gradual, evolving transitions
overshoot_factor (0.1-0.8):
Low (0.1-0.3): Subtle anticipation
Medium (0.3-0.6): Natural elastic feel
High (0.6-0.8): Exaggerated, dramatic overshoot
tension_strength (0.05-0.4):
Low (0.05-0.15): Subtle dynamic variation
Medium (0.15-0.25): Expressive phrasing
High (0.25-0.4): Dramatic, intense dynamics
vibrato_amount (0.1-0.6):
Low (0.1-0.3): Subtle articulation
Medium (0.3-0.45): Expressive ornamentation
High (0.45-0.6): Prominent, emotional vibrato
Morphing Presets
| Preset | Target Sequence | Smoothness | Overshoot | Tension | Character |
|---|---|---|---|---|---|
| Gentle Waves | 0_3_-2_5_-1_2_0 | 2.0 | 0.2 | 0.05 | Subtle, flowing contours |
| Emotional Arcs | 0_7_-5_12_-8_15_-12 | 1.8 | 0.3 | 0.15 | Expressive vocal phrasing |
| Dramatic Leaps | 0_12_-12_24_-24_12_0 | 1.2 | 0.6 | 0.25 | Intense pitch jumps |
| Chromatic Walk | 0_2_4_5_7_9_11_12... | 1.5 | 0.1 | 0.08 | Melodic step sequences |
| Microtonal Glide | 0_1.5_-1_2.5_-0.5_1... | 2.5 | 0.15 | 0.03 | Subtle pitch inflections |
| Tension Build | 0_3_1_6_2_9_4_12_5 | 1.3 | 0.4 | 0.3 | Gradual intensity increase |
| Chaotic Dance | 0_7_-3_15_-8_5_12_-5... | 0.8 | 0.8 | 0.4 | Unpredictable, energetic |
🎵 Musical Applications
Gentle Waves: Create natural-sounding pitch variations for vocal processing and instrumental expression
Emotional Arcs: Design expressive pitch narratives that build and release tension musically
Chromatic Walk: Generate melodic sequences and scale-based pitch movements
Microtonal Glide: Explore subtle pitch inflections and non-Western tonalities
Tension Build: Create dramatic pitch arcs that increase in intensity over time
Applications
Expressive Vocal Processing
Vocal Phrasing Enhancement: Use Emotional Arcs or Gentle Waves to add expressive pitch contours to vocal performances that enhance the natural phrasing without sounding artificial or auto-tuned.
Melodic Design: Create custom target sequences that follow specific melodic patterns or harmonic progressions for vocal processing that aligns with musical context.
Instrumental Expression
Pitch Articulation: Apply morphing to sustained instruments to create dynamic pitch movements that emulate expressive instrumental techniques like string portamento or wind instrument pitch bends.
Microtonal Exploration: Use the Microtonal Glide preset or create custom sequences with decimal values to explore quarter-tones and other microtonal intervals.
Algorithmic Composition
Generative Melodies: Combine the script with algorithmic target generation to create evolving pitch sequences that change based on mathematical patterns or random processes.
Structural Pitching: Design target sequences that correspond to musical form, with different target sets for verses, choruses, and bridges.
Sound Design and Film Scoring
Narrative Pitch Arcs: Create pitch contours that follow emotional narratives for film scoring, with targets representing different emotional states or story beats.
Character Voice Design: Use specific target sequences to create distinctive pitch personalities for animated characters or voice effects.
Technical Considerations
Target Distribution: Targets are evenly distributed across the audio duration. Very long sequences may create rapid transitions if the audio is short. Consider the relationship between target count and audio length.
Extreme Parameters: Very high overshoot factors (>0.7) combined with large pitch intervals can create extreme pitch excursions that may sound unnatural or cause artifacts.
Custom Sequence Design: When creating custom target sequences, consider the musical relationship between consecutive targets. Larger intervals work well with higher tension settings, while smaller intervals benefit from smoother transitions.