Open system preferences
Select Speech (looks like a 1930's radio mic)
Select Text To Speech tab
There you will see a drop down tab with various voices where it says System Voice
play around with the voices and the sliding pitch to find something to your liking
Select Speech (looks like a 1930's radio mic)
Select Text To Speech tab
There you will see a drop down tab with various voices where it says System Voice
play around with the voices and the sliding pitch to find something to your liking