The only changes in sound we can make at the level of the larynx is to raise and lower the pitch and loudness.

The action of the vocal folds is much like that of the lips when we make the "Bronks Cheer." We hold our lips together firmly and force the air though to make them vibrate, albeit with a sputtering sound.

The vocal folds are much smaller, of course, and capable of faster and finer vibrations. The result is the beginnings of voice. Not that it sounds all that great, at that point. Originally, it is really a rather pitiful squeak.
It is left to the resonators to shape the vocalization into something we would recognize as a human voice.

The only changes we can impose upon sound at the level of the larynx are to raise and lower the volume (which is really a matter of breath control) and to raise or lower the the pitch. The latter we do by changing the tension of the vocal folds.

Typically, the mass of the vocal folds remain constant. However, there is a rapid increase in mass for boys particularly, during puberty.