@techreport{shehzad2026pipervoices,
  author = {Shehzad, Asad},
  title = {Open Piper TTS Voices Ranked: Naturalness, Clarity and Licences},
  institution = {Loudness.ai},
  number = {LA-RB-2026-003},
  year = {2026},
  month = {October},
  note = {Version 1.0; published 2026-10-15},
  url = {https://loudness.ai/research/piper-tts-voices-ranked/}
}