The best method I've seen for straight ripping/converting,
is running the rom through VGMTrans,
Find the Song, right click, and say "save as midi and sf2"
You can download the free version of SoundFount (sound font 1) and load up the files,
You'll be able to set a loop point if you want, (for shorter tracks)
Then just click "play to file" And you can save it as a wave file, or many other types.
It may not be 100% perfect sounding, but I can't tell.
And it about as good as you can get without recording straight from the game.