I like the variation you put in this composition, but I have a problem with how you used the C00 command. When C00 is executed, all the notes stop playing starting from the same row. So what you could have done was start a new frame and put the C00 command on the first row so all the notes are played before the song stops.
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If that's what you mean, then it is indeed a very minor improvement to an end and I appreciate your take on such a subtlety; that's the kind of stuff I like to hear.