Here’s a video I made on using the Papagayo program: http://www.lostmarble.com/papagayo/ and Synfig’s .lst file feature to lipsync with a folder of phoneme .png pictures. (sorry it’s only in English.)
https://www.youtube.com/watch?v=S8rFv_pjfgs
It’s based on this tutorial on the Wiki http://wiki.synfig.org/wiki/Doc:Lipsync