The CSS reference

"pitch-range" - css property (v. css 2)

• To specify the variation in the speaking voice. (Monotone voice or animated voice?)
• A value between '0' and '100' or inherit.
• A pitch range of '0' produces a flat, monotonic voice.
• A pitch range of 50 produces normal inflection.
• Pitch ranges greater than 50 produce animated voices.
• Initial value: 50
• The property is inherited
• HTML usage: all elements
• The perceived pitch of a human voice is determined by the fundamental frequency and typically has a value of 120Hz for a male voice and 210Hz for a female voice.
• Browsers that support the pitch-range - property :
  
  

h1 {pitch-range: 70 }