Commodore 128D User Manual page 164

As a rule, always start with the note with the longer duration. For
example, if a bar starts with a series of two sixteenth notes on the
lower staff for voice 2 and the upper staff starts with an eighth note
for voice 1, enter the eighth note in the string first since it must play
for the duration while the two sixteenth notes are being fetched by
the Commodore 128. You must give the computer time to play the
longer note first, and then PLAY the notes of shorter duration, or else
the composition will not be synchronized.
Here's the program that plays Invention 13. Enter it into your C128,
SAVE it for future use, and then RUN it.
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156 USING C128 MODE—Sound and Music in C128 Mode