Hi, first post on this forum, name is Martin and QTH is just outside Hastings. Now able to access easily through GB7CK.
I have been playing with text to speech, tried Festival and Festvox and whilst they work fine the voices available are not as good as AT&T.
Found a site https://www.yakitome.com
which does online tts free with limited voices but has "Audrey" which seems to be same as the AT&T one and you can download an .mp3 file.
What I did was type in the voice announcements that I wanted separated by commas (essential to create gaps in the audio file), download the .mp3 and open in Audacity. I changed the sampling rate to 8khz then selected each announcement and exported to individual .wav files. CPS accepts and loads these files fine into DM4601. Left the volume level alone and seems ok.
Hope this may be of help to others.