You can add voices to the System Voice pop-up menu by choosing Customize. If you don’t see the voice or language you want Adjust how fast the voice speaks by dragging the Speaking Rate slider.
To add voices on Mavericks Choose a voice You can delete a voice that you downloaded to your Mac. If you add a voice that’s not on your Mac, it’s automatically downloaded from Apple. You can add voices to the System Voice pop-up menu. Mac offers a variety of voices through S ystem Preferences. Language voices for Mac can be installed through the Mac OS X operating system.
