ATR Harmony in Legbo

If it's something like rounding harmony or backness harmony or height harmony, it is usually from stem to affix. You also see that with ATR harmony, but you do see the opposite. In legbo, which was a language studied by Jeff Goode, this happens in certain types of affixes and they'll actually spread to the stem. And there's also sometimes secondary articulations like pharyngealization or nasalization,. Often it seems there's a, like some vowels that are neutral that don't participate in vowel harmony.