Hmm, I guess there is a lot of audio looking at the soundtrack - the length of the three parts that have singing in is almost 13 minutes, even though not all of it requires voice. The Aria itself in the game is 4 minutes though, so I guess that bit at least might be possible, when you look at the size difference between the ROMs of FF6 and ToP/SO (those two are the largest two SNES ROMs in existence, both each double the size of FF6 ). Oh well, I guess it'll never happen though, did they even bother with vocals in the PSX remake?

I think you'll have to resort to filesharing programs for the ROMs, I can't find any working download sites on Google either SO has extra graphics complications though so that one will end up at around a 10 MB download instead of 6 MB to get the patches to make the graphics work in the emulator.