- **Need to reply with audio**: synthesize with `kesha say "" > reply.wav`. Auto-routes by detected language (Kokoro-82M for English, Piper for Russian). For other languages and ~180 more voices use `--voice macos-*` on macOS (zero model download).
- **Need to detect what language a file is in** before choosing a pipeline: `kesha --json audio.ogg` returns both audio-based and text-based language detection with confidence scores.