Sims, Nathaniel. The suprasegmental phonology of Yonghe Qiang in typological understanding. 2017. hh:phon:Sims:Yonghe-Qiang:2017
Glottal stops are inserted before phrase-initial vowels, and may also be inserted after phrase-final vowels.
Simplex disyllables have three surface melodies, analyzed as coming from the interaction of accent (stress) placement and a phonemic low tone.
Unaccented vowels are subject to devoicing in some unspecified environment: "low vowels are slightly devoiced; mid vowels are more devoiced than the low vowels; high vowels ... are even further reduced; schwa is often deleted entirely."