Hi @none none , Thanks for using Microsoft Q&A Platform.
I can understand your disappointment in not being able to utilize the Microsoft Azure free TTS demo. The free TTS demo has been removed from Azure TTS site.
But you can try similarly from speech studio portal: https://speech.microsoft.com/portal
There is no direct equivalent demo, but a mixture of Voice Gallery and Audio Content Creation are relevant. Links to Voice Gallery and Audio Content Creation demos can be found at:
Speech Studio - Audio Content Creation (microsoft.com)
If you'd like to provide feedback on this, you can do so here: https://feedback.azure.com/d365community/forum/09041fae-0b25-ec11-b6e6-000d3a4f0858
I hope this helps.
-Please kindly accept the answer and vote 'Yes' if you feel helpful to support the community, thanks.