So I downloaded some midi file and imported it into Utau, and since I'm new to the midi aspect of things I'm not sure of how to make sense of things... Whenever I try playing the notes a warning message pops up and says that a wav file can't be generated. Also, each note (showing up as 'a', of course) has that envelope '!' sign above it, and trying to reset/normalize them doesn't work.. Any ideas to make the file work?