Local text-to-speech using Piper voices via sherpa-onnx. 100% offline, no API keys required. Use when user asks for a voice reply, audio response, spoken answer, or wants to hear something read aloud.
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Generate voice audio replies using local Piper TTS via sherpa-onnx. Completely offline, no cloud APIs needed.
cd scripts sudo ./install.sh
sudo mkdir -p /opt/sherpa-onnx cd /opt/sherpa-onnx curl -L -o sherpa.tar.bz2 "https://github.com/k2-fsa/sherpa-onnx/releases/download/v1.12.23/sherpa-onnx-v1.12.23-linux-x64-shared.tar.bz2" sudo tar -xjf sherpa.tar.bz2 --strip-components=1 rm sherpa.tar.bz2
sudo mkdir -p /opt/piper-voices cd /opt/piper-voicesGerman - thorsten (medium quality, natural male voice)
curl -L -o thorsten.tar.bz2 "https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-de_DE-thorsten-medium.tar.bz2" sudo tar -xjf thorsten.tar.bz2 && rm thorsten.tar.bz2
English - ryan (high quality, clear US male voice)
curl -L -o ryan.tar.bz2 "https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_US-ryan-high.tar.bz2" sudo tar -xjf ryan.tar.bz2 && rm ryan.tar.bz2
sudo apt install -y ffmpeg
Add to your OpenClaw service or shell:
export SHERPA_ONNX_DIR="/opt/sherpa-onnx" export PIPER_VOICES_DIR="/opt/piper-voices"
{baseDir}/bin/voice-reply "Text to speak" [language]
| Parameter | Description | Default |
|---|---|---|
| text | The text to convert to speech | (required) |
| language | | auto-detect |
# German (explicit) {baseDir}/bin/voice-reply "Hallo, ich bin dein Assistent!" deEnglish (explicit)
{baseDir}/bin/voice-reply "Hello, I am your assistant!" en
Auto-detect (detects German from umlauts and common words)
{baseDir}/bin/voice-reply "Guten Tag, wie geht es dir?"
Auto-detect (defaults to English)
{baseDir}/bin/voice-reply "The weather is nice today."
The script outputs two lines that OpenClaw processes for Telegram:
[[audio_as_voice]] MEDIA:/tmp/voice-reply-output.ogg
[[audio_as_voice]]MEDIA:path| Language | Voice | Quality | Description |
|---|---|---|---|
| German (de) | thorsten | medium | Natural male voice, clear pronunciation |
| English (en) | ryan | high | Clear US male voice, professional tone |
Browse available Piper voices at:
Download and extract to
$PIPER_VOICES_DIREnsure
SHERPA_ONNX_DIRbin/sherpa-onnx-offline-ttsCheck that voice model files exist:
*.onnxtokens.txtespeak-ng-data/Ensure the output includes
[[audio_as_voice]]MEDIA:No automatic installation available. Please visit the source repository for installation instructions.
View Installation Instructions
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