With MP3, you will have an inherent loss in sound quality as the encoder removes some of the sound data to enable compression of the file. Since to convert it to OGG, you lose even more sound data, an MP3 to OGG conversion will never sound as good as the original recording. This particular problem has its roots in both encoders, so without the original wave file, this problem is, in effect, permanent.
Oh, and you've got the sound files mixed up, Erik. Although the third song, lev-3-awe/gus was supposed to be for level 3, it was actually used in level 2 in Webfoot DROD. In a similar fashion, piece 2 was used in level 3, piece 4 in level 5, piece 5 in 8, piece 6 in 7, piece 7 in 4 and piece 8 in 6.
With regards to the third piece, I really like it, although it's in a form that I've never heard before. However, the last 45 seconds of it or so, in my opinion the best bit, and the part which inspired me to compose my own DROD music, I still think sounds better on mine.
Thanks Erik!
____________________________
Resident Medic/Mycologist