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Simulations of phonation are presented which assess the degree to which the vocal tract resonator affects sound production by the flow-induced vibration of the vocal folds.  The computations are performed with the iFEM aeroelastic-aeroacoustic approach.  For each case of larynx geometry and biomechanical properties, four simulations are run, one each for a vocal tract shape corresponding to the vowels (/a/,  /i/ , /u/, and /ə/).  To quantify how differences in vocal tract acoustic loading affects the source behavior, comparisons are made for the following quantities:  vocal fold vibration patterns, glottal exit volume flow, glottal jet speed, vocal fold drag, work done by built-up pressure, and work done by acoustic resistance.