Speak - normal none spell-out inherit
Speak-numeral - digits continuous inherit
Speak-punctuation - code none inherit
Play During
Elevation deg grad rad - below level above higher lower inherit
Azimuth
Stress

Pause
Pause-after s ms % - inherit
Pause-before s ms % - inherit
Cue
Cue-after
Cue-before
Richness

Volume number % - silent x-soft soft medium loud x-loud inherit
Pitch
Pitch-range
Voice-family
Speech-rate
Speak-header - once always inheritoption>