I dunno if it's just me, but the background choir in d_messag (between 1:11 and 2:11) sounds awfully off-key. This can't be intended, doesn't sound anything like the original MIDI at all. Something similar must have happened with the background strings in d_the_da (3:45-5:12 and 5:30-end).
The other songs don't seem to have any issues and sound great. ^^