Commodore 128D - Page 141

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This program segment plays the variable pulse waveform in the
range of frequencies from 1 through 65535, in increments of 100,
from lowest frequency to highest. If you don't specify the waveform,
the computer selects the default value of waveform 2, the variable
pulse waveform.
Now change the waveform with the following program line (60) and
try the program again:
60 SOUND 1,1,1,0, 0,0, 0,0
Now the program plays voice 1, using the triangle waveform, for the
range of frequencies between 1 and 65535 in increments of 100.
This sounds like a typical sound effect in popular arcade games. Try
waveform 1, the sawtooth waveform, and see how it sounds wi.th
this line:
60 SOUND 1,1,1, 0, 0, 0,1, 0
The sawtooth waveform sounds similar to the triangle waveform
though it has less buzz. Finally, try the white noise waveform (3).
Substitute line 60 for this line:
60 SOUND 1,1,1, 0, 0, 0, 3, O
Now the program loop plays the white noise generator for the entire
range of frequencies. At first, there is a low-pitched rumbling sound.
As the frequency increases in the loop, the pitch increases and
sounds like a rocket taking off.
133
USING C128 MODE—Sound and Music in C128 Mode