The most likely problem is the sample rate of the audio file. The Poser manual needs to be updated with info like this.

Correction....... You say there is no LipSync folder? That may be your problem right there. That folder contains the Face data for each character that comes with Poser.  Your sig says you have all versions of Poser. If you are doing this in PP2014 I must ask if you have downloaded all the files when you upgraded or installed your new version of Poser,

I'll whip up a fast tute and get back to this thread but check your installation while I'm gone. I do not have a LipSync folder in PP2010 but I have it in both PP2012 and PP2014.