Voice output alters when using tag in POLLY

Question

Amazon Polly question.

I have a sentence, such as "it will be OK."

When I change the script to 
"It will be OK. "

or to

"It will be O K. "

The output sounds muffled for that sentence only, then goes back to how it sounded in the rest of the script.

I'm using:
* Neural engine
* English, US language
* Matthew, Male voice
* SSML turned on

The same thing happens when I use any 'interpret as=' tags

Is anyone else running into this issue? It's very distracting and I can't figure out why it is happening.

Thanks for any help you can give me.

Answer

The neural voices don't support the say-as tags, so for that sentence AWS shifts to the standard voice.  Per the [documentation](https://docs.aws.amazon.com/polly/latest/dg/supportedtags.html#say-as-tag), "This option is not currently supported using neural voices. If this SSML code is encountered by Amazon Polly at run-time, the affected sentence will be synthesized using the related standard voice. "

Voice output alters when using tag <say-as interpret-as="characters"> in POLLY

Conteúdo relevante