Yes, the speed can be controlled by placing the TTS text within SSML<prosody/> tags. Using the prosody tags allows the developer to control the pitch, rate, duration, and volume of the text that will be spoken by the TTS Engine. For additional information, please visit Genesys at: http://developer.voicegenie.com/voicexml2tagref.php?tag=ss_prosody&display=ssmltags.