Cepstral Duchess 6.2.3.801 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The common filename for the program's installer is swifttalker.exe.
This software is an intellectual property of Cepstral LLC. We recommend checking the downloaded files with any free antivirus. You can install Cepstral Duchess on Windows XP/Vista/7/8/10/11 32-bit. The most popular versions among the program users are 6.2, 5.2 and 5.1. The program lies within Multimedia Tools, more precisely Codecs.
From the developer:
Cepstral Duchess is a Character for a synthetic voice that can say anything, anywhere, with personality and style. It can bring fresh content to your ears, on demand from the smallest device to large installations and high-end interactive media. Now you can have your laptop or desktop speak to you in one "real" voice.
You may want to check out more software, such as Cepstral Allison, Cepstral Callie or Cepstral Miguel, which might be related to Cepstral Duchess.