SSML

You can customise the speed and tone of Text to Speech voices with SSML (Speech Synthesis Markup Language). QR Translator supports SSML files that are in accordance with Microsoft‘s guide to SSML:
https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-structure

To upload an SSML file, open the advanced settings dialog by clicking the  button.
Under Text to Speech, click the  to open the file browser (CKfinder). Click “upload” and choose your SSML file. Once uploaded, the file will appear in the file browser: Double-click the file to select it.