The PSOLA and LPC-based synthesis functions have been among Akustyk's most popular features. In version 1.9.2, I added another module, Create global synthesis...
. The module adds F4, F5, B4, and B5, and allows the user to check formant tracks in a Praat Formant Grid object to look for possible "jumps" or "drop-outs." This feature was designed by Anne van Leeuwen (thanks!). It will be particularly useful to researchers who need to control five formants and five bandwidths independently. The user interface and general principle is very similar to that of Create basic synthesis...
and you can find out more by viewing this video tutorial.