Commercial Use of a Recorded Output of Speech Synthesis made via Web Speech API using Chrome

[R Rabinovici]

I use the Web Speech API via Chrome / Firefox to synthesize speech of my original text.

I record the output audio using some other software. 

Do I own the copyrights to that recording? Can I sell the recorded audio file? Can I use it in my commercial YouTubes for instance?

It would seem to me - I am indeed the owner of the recording, as the speech api is given as one of the browser's services, which I can use to produce my own content. But - I would like to be sure. 

The closest answer by Google I saw is here:

https://lists.w3.org/Archives/Public/public-speech-api/2013Jul/0001.html

Which says the web speech api can be used for commercial. My specific question is about the recorded audio file.

Thanks