@afelix Thanks for the scripts! It seems however, you made some refactoring before upload.
The name of the file av_synthesis_voice_quality should be av_speech_synthesis_voice_quality.py and of av_synthesis_voice_gender.py should be av_speech_synthesis_voice_gender.py. For av_speech_synthesizer the .py is missing.
For everybody else struggling with the module: it is important to restart Pythonista after upload.