To examine the possibility that pharyngeal voice quality settings are not independent of pitch differences or of their effect on each other, pharyngealized voice, faucalized voice, raised-larynx voice and lowered-larynx voice were produced under controlled phonetic conditions at eight separate, incremental pitch intervals and analyzed using auditory, spectrographic, and vowel-formant tracking. Results suggest an interdependent relationship between raised-larynx voice and pharyngealization, and between lowered-larynx voice and faucalization. These relationships are realized at several pitch increments, and may reflect some pitch dependence; that is, pharyngealized voice may mask raised-larynx voice at low frequencies, and faucalization may mask lowered-larynx voice auditorily at high frequencies. At the highest frequencies (falsetto range), pharyngealized and faucalized voices, and to some extent lowered-larynx voice, cannot be distinguished. A close front vowel is differentiated the most consistently, while a close back vowel is most often undifferentiated for pharyngeal quality. To explain these relationships, it is posited that for raised-larynx voice at certain (low) frequencies, the vocal tract is configured in a manner that is the same as for pharyngealization; and that for faucalization at certain (low) frequencies, the vocal tract is configured in a manner that is the same as for lowered-larynx voice.