Pinyin audio credits
====================

All pinyin audio on this site — the primer's demonstration clips
and every per-syllable citation — is SYNTHESIZED in one standard
voice (ElevenLabs, model eleven_multilingual_v2, voice
UFDAUkGzdLAEJlINT3Fx; the school's ruling of 2026-08-15: no one
pronounces the classical language natively, so one consistent
conventional voice teaches best). Every clip is pitch-verified
against the tone its pinyin declares and loudness-normalized
(mono 64 kbps mp3) before it may ship; a clip that does not sing
its tone is refused and regenerated.

The full per-file registry is CREDITS-syllables.txt in this
directory (and CREDITS-lines.txt under /assets/audio/lines/ for
whole-line readings).

Until 2026-08-15 this directory carried human recordings from
Wikimedia Commons by Wei Gao and Nicolas Vion (Shtooka Project),
Yue Tan, Xudong Yang, and Peter Isotalo, under CC BY and
CC BY-SA — with thanks; they are preserved in the repository
history.