8. An apparatus comprising at least one processor and at least one memory storing computer program code for one or more programs, wherein the at least one memory and stored computer program code are configured, with the at least one processor, to cause the apparatus to at least: generate a plurality of input models representing an input by using a statistical model synthesizer to statistically model the input; determine a speech unit sequence representing at least a portion of the input by using the input models to influence selection of one or more pre-recorded speech units having parameter representations identify one or more bad units in the speech unit sequence, wherein determining the speech unit sequence and identifying one or more bad units in the speech unit sequence are performed substantially simultaneously; and replace the identified one or more bad units with one or more parameters generated using the statistical model synthesizer.
8. An apparatus comprising at least one processor and at least one memory storing computer program code for one or more programs, wherein the at least one memory and stored computer program code are configured, with the at least one processor, to cause the apparatus to at least: generate a plurality of input models representing an input by using a statistical model synthesizer to statistically model the input; determine a speech unit sequence representing at least a portion of the input by using the input models to influence selection of one or more pre-recorded speech units having parameter representations identify one or more bad units in the speech unit sequence, wherein determining the speech unit sequence and identifying one or more bad units in the speech unit sequence are performed substantially simultaneously; and replace the identified one or more bad units with one or more parameters generated using the statistical model synthesizer. 13. The apparatus of claim 8 , wherein the input further comprises one of text to be converted into speech or speech in a first voice to be converted into a target voice.