Editorial review
Humming, SOVTE, lip trills and vocal glides
Understand common semi-occluded exercises, what they are used for and how to keep exploration gentle.
What semi-occlusion means
Semi-occluded vocal tract exercises partly narrow the exit of the vocal tract. Examples include lip trills, humming, voiced fricatives and phonation through a straw. The narrowing changes pressure and acoustic interaction above the vocal folds.
A gentle sequence
Begin at an easy pitch and quiet-to-moderate volume. Sustain a comfortable hum, then make a small glide and return. A lip trill should remain loose rather than forceful. Transfer the easy sensation to a syllable and then a short phrase.
Exercise is not treatment
Different tasks suit different people and goals. More resistance or a larger range is not automatically better. Stop with pain, irritation or increasing effort. Persistent voice changes deserve assessment from a qualified professional.