Acapela 2011 AIO (5 in 1) | 564 MBText-to-speech engine or engines of speech synthesis - a program made in the form of system drivers, designed to convert text into speech. Speech synthesis engines have an external interface, so that your computer is talking, not only install the engine. To use the engine program is needed speech synthesis (TextAloud, Cool Reader, Balabolka etc), which acts as the interface allows you to work with the engine, change its settings, the sound of speech, use additional features