Commodore 128D - Page 163

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The best way to start coding a song into your Commodore 128 is by
breaking the notes down into an intermediate code. Write down the
upper staff notes on a piece of paper. Now write down the notes for
the lower staff. Precede the note values with a duration code. For
instance, precede an eighth note with an 8, precede a sixteenth note
with a 16, and so on. Next, separate the notes so the notes on the
upper staff for one measure are proportional in time with the notes
for one measure on the lower staff.
If the musical composition had a third staff, you would separate it so
the duration is proportional to the two other upper staffs. Once the
notes for all the staffs are separated into equal durations, a separate
dedicated voice would play each note for a particular staff. For
example, voice 1 would play the upper staff, voice 2 will play the 2d
staff and voice 3 would play the lowest staff if it existed.
Let's say the upper staff begins with a string of four eighth notes. In
addition, say the lower staff begins with a string of eight sixteenth
notes. Since an eighth note is proportional in time to two sixteenth
notes, separate the notes as shown in Figure 7-13.
8B 8C 8D
V1
8A
V2= 16D16E 16F16G 16A16B 16C16D
Figure 7-13. Synchronizing Notes for TWo Voices
Since the synchronization and timing in a musical composition is
critical, you must make sure the notes in the upper staff for voice 1,
for example, are in time agreement with the notes in the lower staff
for voice 2. The first note in the upper staff in Figure 7-13 is an A
eighth note. The first two notes for voice 2 are D and E sixteenth
notes. In this case, you must enter the voice 1 eighth note in the
PLAY string first, then follow the voice 2 sixteenth notes immediately
after it. To continue the example, the second notain Figure 7-13 for
voice 1 (the upper staff) is a B eighth note. The B eighth note is equal
in time to the two sixteenth notes, F and G, which appear in the bot
tom staff for voice 2. In order to coordinate the timing, enter the B
eighth note in the string for voice 2 and follow it with the two six
teenth notes, F and G, for voice 2.
155 USING C128 MODE—Sound and Music in C128 Mode