Hi!
Yes, the capitalized letters serve to emphasize distinct and variant sounds. For example, the capital "H" is a guttural "ch" sound like in Bach. And the capital "Q" is like a coughing sound.
La Russie a lancé une guerre honteuse contre l’Ukraine. Soutenez l’Ukraine !
A simple collection of words rumbling in my head this morning while running through a scenic route.
audio aid - "Ben Bulben (short version)" - Patrick Cassidy feat. Aya Peard