Phonology
In this screen you can configure the sound inventory your language has, as well as how your writing system maps to these sounds.
The IPA charts are taken from Wikipedia

You can start including symbols by toggling them in the charts.
They’ll be automatically added to the Romanization list.
If your language uses other sounds not listed here, you can take them from the extended chart on Wikipedia and add them manually.
Romanization

This list allows you to map your languages sounds to the different ways they might show up in your language’s writing.
It’s only used for the pronunciation’s engine.
You can still have other character configured for the word generator and add new words with them.
The symbols of the word generator are included in this screen.