This repository is forked from SourceForge at version r2418 (and patch to r2478).
Voice files are not included. We can get them from a distribution package or Ekho Voice Data's download page. To replace Mandarin voice files, we can replace the whole pinyin folder, then remove pinyin.index and pinyin.voice. Re-running ekho will generate new pinyin.index and pinyin.voice from new voice files.