I tried re-installing this over and over. I tried to submit a report to technical support about my problem, but they only help you if you purchase something. The thing is, I can't change an entire sound file with Voxal. The ending is cut off of it after processing. The only way I found to get around this is to first add some silence after the file (3 minutes works for all but the largest sound files) and then processing it, removing whatever silence is left at the end of the audio file. This is a pain in the neck. I don't know if this is some limit imposed for the purpose of making this a demo version, but I have found absolutely nothing to say either way. Whatever the case, I can find some truly free freeware voice changers somewhere else.
I think this one is fun. I use the pixie, male, and chipmunk voice the most. My friends get a good kick out of it. I have a USB mic and it works just fine. I wish there was a way to get more voices though.