9. The method of claim 1 , wherein prior to playing back the virtual utterance to the user, the method further comprises: setting frequency parameters in a speech generation algorithm in a speech recognition engine at the telematics unit.
9. The method of claim 1 , wherein prior to playing back the virtual utterance to the user, the method further comprises: setting frequency parameters in a speech generation algorithm in a speech recognition engine at the telematics unit. 10. The method of claim 9 , wherein setting frequency parameters in the speech generation algorithm, comprises: providing one or more user-selected ranges of frequencies to a call center from the telematics unit; receiving a frequency-adjustment algorithm at the telematics unit from the call center based on the user-selected range of frequencies; and applying the frequency-adjustment algorithm to the speech generation algorithm, wherein the speech generation algorithm is programmed to generate acoustic waves having frequencies only within the user-selected range of frequencies.