As I have made the audio files over a long period of time while I was figuring out the software, you will absolutely come across files that are not up to studio quality.
You are welcome to go through all of the files then pick and chose which ones you wish to import :D
I have been using xVASynth for a long time now and started not knowing what I was doing, so some audio quality might not be the best, but some will be OK too :D
The next thing I will do is work on conjunctions which will help with stitching together sentences if you happen to like VAMMoan2. I have been using triggers and getting random sentences to be generated ...its great :D
You are welcome to go through all of the files then pick and chose which ones you wish to import :D
Good luck