Spectral Composition (Saariaho style)

Start with a Harmonic Series node set to your chosen fundamental (e.g., 131 Hz for C3). Generate 16 or more partials to create a rich harmonic field. Connect this to one input of a Spectral Morph node, and connect a second Harmonic Series (with a different fundamental) to the other input. The morph parameter (0.0–1.0) controls continuous interpolation between the two harmonic worlds — automate it with a BPF for gradual harmonic transformation over time.

Feed the morphed output through a Formant Filter to impose vowel-like resonance characteristics on the pitch material. Set formant centers to approximate vowel frequencies (e.g., [270, 2300, 3000] for an "a" vowel, [400, 2000, 2600] for an "e" vowel). This creates a timbral connection between the abstract pitch material and the human voice, a hallmark of spectral composition.

Connect the filtered pitches to a Chord node, pair it with a Rhythm Tree, and assemble everything in a Voice node for notation export. For additional refinement, use the Noise-Tone Axis node to map a BPF to articulation markings that trace the tone-to-noise continuum across the passage.