@ikidd@lemmy.world pointed me to piperTTS and i ended up with a python virtual enviroment, pip install piper-tts and de_DE-thorsten-high.onnx+json to be able to run echo “{{ $json.state}}” | piper -m ./de_DE-thorsten-high.onnx -f voice.wav && aplay voice.wav

and indeed that sounds much better than pico and espeak