Cepstral SAPI5 TTS Voices from NextUp.com Cost: $29 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 Cepstral SAPI5 TTS Voices from NextUp.com: Exciting new voices from Cepstral. are now available for only $29.95 each. These high quality voices take up less disk space (average less than 50mb) than most premium voices, do not use as much processor power, and are very fast when creating audio files. These SAPI5 compliant voices are supported by all NextUp.com products as well as most other speech products.