Natural voices in Microsoft Edge do not support the ability to control pitch

[HadrienGardeur]

This issues was first reported by @Falcosc in https://github.com/HadrienGardeur/web-speech-recommended-voices/discussions/34

While the Web Speech API allow developers/users to control the pitch and speed rate of each voice, it seems that pitch has no impact whatsoever on Microsoft's natural voices.

Steps to reproduce this issue:

• open Microsoft Edge on Windows or macOS
• go to https://mdn.github.io/dom-examples/web-speech-api/speak-easy-synthesis/
• select any Microsoft Natural voices
• type text
• change the pitch and play (repeated several times to test various pitch values)

[Falcosc]

While having the pitch support idea, I did not even think about treating it as an issue, since we know it is about these new trained voices. But you are right, they could easily fix it by just applying audio transformation on their side or on client side.