Good MP3 To Ogg Converter Software

[MFG38]

But, what if the OST is from a game long gone and not avaiable to buy?

In that case, one option you have is to look for the OST on YouTube and get audio versions of the appropriate videos using a YouTube converter/downloader, which are all over the Internet. Then just use one of the programs above if further conversion is needed.

[wildweasel]

Also, just because a soundtrack is not available to buy, does not mean the copyright has expired.

[Hexereticdoom]

Another excellent alternative -and also a good substitute for Format Factory- is this one:

https://file-converter.org/

Very recommended, it works like a charm!