Factory Audio Converter
Full user review
"Good audio converter (wav to mp3)"
It's a good audio converter, which was able to convert 27 folders of wav files to mp3 without any errors. Unlike OldWisty I didn't notice any additional crap. This audio converter is not free. I believe it's shareware, but definitely not adware.
No cons thought I didn't explore other audio formats yet.
I like the way Factory Audio Converter processed my files, recommend it to anybody.