# Changelog – Harmonic Frontier Audio: Subharmonic Phonation / Vocal Fry (Preview Pack)

## v0.9 – November 2025
- Initial release of the **Overtone Singing Preview Pack**
- Includes: sustained fundamental tones with harmonic intervals, arpeggios, scales, glissandi, and a short original melodic exercise demonstrating transitions between harmonics
- Recorded in a treated studio environment using a Rode NT1-A microphone → Zoom F8n Pro signal chain
- Captured at 96kHz / 32-bit float and exported as 96kHz / 24-bit mono WAV
- 3–5 ms fade-ins and fade-outs applied for transient consistency; no normalization or post-processing used
- Non-lexical, culturally neutral representation of the overtone singing technique, referencing traditions such as Tuvan and Mongolian throat singing and Tibetan Chant but not imitating any specific style
- Metadata sheet, README documentation, and rights declaration included