Why would you convert MP3 to Vorbis? You do know that lossy format to lossy format = more loss, right? It sounds like you know your way around a computer pretty well, so I am quite curious as to your reasoning behind this.
I do it because I don’t like the way the mp3 a*se bandits went about waiting until it was just about a univresal format before demanding licence fees.
Ogg-Vorbis is licenced in such a way that they can’t all of a sudden start charging a licence fee.
Yes I am aware that transcoding reduces the quailty but it is barely noticeable, that I can live with, being a puppet of turd smugglers I can not.
Read for yourself how much these the puke masters charge: