The rest of the model.
•A model is a sequence of targets.
•Each target has a strength.
•One target per tone.
•Targets are stretched to fit syllable duration.
•Only one phonological rule: 33®23
We used one phonological rule from Dr. Shih’s thesis.   While we got good results using it, and believe it to be necessary, we haven’t formally tested it.   We see no need for other phonological rules like 22->21.  The seem to be able to be described by our phonology here (I.e. the math).