Here are some preliminary screenshots of the Nextens Gui.

1. the the ToDI annotation window, which allows you to modify the intonation of an utterance
2. the the F0 window, which shows segments, their durations, and the fundamental frequency contour
3. the the parameters window, which allows you to modify speech synhesis parameters for speaking rate and intonation
4. the the command line window, which gives access to the underlying Festival Scheme interface