The voice selection is controlled by Google in Chrome Apps and Extensions. Chrome limits your voice selection to your 'native' voice and any Chrome Voice Extensions you may have installed.

   The 'native' voice is your OS default voice and can be set through your system speech settings.
Not all Windows operating systems offer a male voice option.

    Mac operating systems have a large list of system voices. When selecting your voice for the Extension or Packaged App, be sure also check the apple voices listed.

    Chromebooks are limited to the default voices Chrome provides and voice extensions. Chrome voice extensions can be found in the Chrome store. The quality of the voice cannot be controlled by Co:Writer Universal,  and any updates to Chrome and to the Chrome voice extensions can positively or negatively effect the voice engines quality.

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