AT&T Natural Voices Cost: $35 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions AT&T Natural Voices: AT&T Natural Voices are the worlds most advanced and human sounding Text To Speech (TTS) voices. Supporting both SAPI4 and SAPI5 interfaces, these voices work within any windows based speech application.