1. A method of speech synthesis, comprising the steps of: (a) receiving first and second text inputs, the content of which collectively forms a reply to a user request, in a text-to-speech system, wherein the first text input is obtained from one data source and the second text input is obtained from a different data source; (b) processing the first and second text inputs into respective first and second speech outputs corresponding to stored speech respectively from first and second speakers using a processor of the system; (c) adapting the second speech output of the second speaker to sound like the first speech output of the first speaker; (d) outputting the first speech output of the first speaker; and (e) outputting the adapted second speech output of the second speaker, wherein the first and second speech outputs include different content and are presented sequentially to a user of the text-to-speech system.
6. The method of claim 1 , wherein step (c) includes: (c1) analyzing acoustic features of the first speech output for at least one speaker specific characteristic of the first speaker; (c2) adjusting an acoustic feature filter used to filter acoustic features from the second speech output, based on the at least one speaker specific characteristic of the first speaker; and (c3) filtering acoustic features from the second speech output using the filter adjusted in step (c2).