OS X 10.6+
Deschideti Script Editor
Copy-paste ca o singura linie:
say "I'm sorry Dave, [[slnc 300]] I'm afraid I can't [[emph +]] do [[emph -]] that." using "Alex" speaking rate 165 modulation 70 pitch 37
Apăsați Play 
Pt alte idei:
https://developer.apple.com/library/archive/documentation/UserExperience/Conceptual/SpeechSynthesisProgrammingGuide/FineTuning/FineTuning.html
