This is an implementation of the Klatt rule system as described in chapter 9 of "From text to speech: The MITalk system", Allen, Hunnicutt and Klatt.

	rules
	rule10 rule2 rule3 rule3b rule4 rule5 rule6 rule7 rule8 rule9a rule9a:next:nextnext: rule9b subRule9a:

	visiting
	clause: phrase: speaker: syllable: word:

	instance creation
	inherents:lowers:

	accessing	top
	defaultDurationFor: Some hardcoded durations for phonemes.
	inherentDurationAt:
	inherents
	inherents:
	lowerDurationAt:
	lowers
	lowers:
	speed
	speed:

	rules	top
	rule10 Rule 10: Shortening in clusters.
	rule2 Rule 2: Clause Final Lengthening.
	rule3 Rule 3: Non-phrase-final shortening. Syllabic segments are shortened by 60 if not in a phrase-final syllable.
	rule3b A phrase-final postvocalic liquid or nasal is lengthened by 140
	rule4 Rule 4: Non-word-final shortening. Syllabic segments are shortened by 85 if not in a word-final syllable.
	rule5 Rule 5: Polysyllabic Shortening. Syllabic segments in a polysyllabic word are shortened by 80.
	rule6 Rule 6: Non-initial-consonant shortening.
	rule7 Rule 7: Unstressed shortening.
	rule8 Rule 8: Lengthening for emphasis.
	rule9a Rule 9a: Postvocalic context of vowels.
	rule9a:next:nextnext: Rule 9a: Postvocalic context of vowels.
	rule9b Rule 9b: Postvocalic context of vowels.
	subRule9a: Sub-rule 9a, independent of segment position.

	visiting	top
	clause:
	phrase:
	speaker:
	syllable:
	word:

	examples	top
	default

	instance creation	top
	inherents:lowers: