Commodore 128 Programmer's Reference Manual page 361

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SOUND AND MUSIC ON THE COMMODORE 128 351
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Experiment with the different combinations of filters to see all the different types
of accents you can place on your musical notes and sound effects. The filters are
designed to perfect the sounds created by the other components of the SID chip. Once
you have created the musical notes or sound effects with the SID chip, go back and add
the FILTERing to your programs to make them as crisp and clean as possible.
Now you have all the information you need to write your own musical programs in
Commodore 128 BASIC. Experiment with the different waveforms, ADSR settings,
TEMPOs and FILTERing. Look in a book of sheet music and enter the notes from a
musical scale in sequence within a play string. Accent the notes in the string with the
SID control characters. You can combine your Commodore 128 music synthesizer with
C128 mode graphics to make your own videos or *'movies" complete with sound
tracks.
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AUDIO INPUT TO THE SID CHIP
The SID chip has a little known additional feature that most computers do not offer:
audio input. This allows you to channel your own music, such as an electric guitar, your
voice through a microphone or any other (high impedence, line level) instrument—you
can actually "jam" with the C128.
In order to connect properly to the computer, you must devise your own cable or
buy one with the correct connections. Get a cable with an 8-pin DIN connector on the
end you are plugging into the C128. Connect pins 2 (ground), 3 (audio out), and 5 (audio
in) on the 8-pin end.
Here's the pinout:
Video Connector—This DIN connector supplies direct audio and composite video
signals. These can be connected to the Commodore monitor or used with separate
components. This is the 40-column output connector.
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