To get started on your Macbook, please go to the settings or the search bar at the top of your Macbook and search for System Voice once you search and select that you will see the following settings
To add new voice options select the default voice option under System Voice
This should show you an entire list of the voice options already available on the device, scroll down to the very bottom and select Manage Voices...
Once here you can select what language you want to download voice packs for on the left and on the right clicking on the cloud with an arrow pointing down will download the specific voice you want
Once you download the voice here it should show up in the Kami Read Aloud tool options.
If you need any further assistance please contact us at support@kamiapp.com