Any text file, at speeds of 25wpm through 140, with any interval using Cepstral’s Lawrence voice.
Free, but I’d like to share the resulting files.
If you have the language Python 2 installed, you can have copy of the program. A few lines need to be changed for Python 3. You’ll also need a copy of Cepstral’s Lawrence voice, and the Swift program that comes with it.
Over 140wpm might be possible, but I’ll have to play with secondary variables. Swift won’t do it automatically.
Other voices can be used, but aren’t calibrated. Swift’s stated wpm are very inaccurate.
Cricket for everyone)