Random Sounds - Commodore 128D User Manual

the "Y" key, the program continues with line 160, which returns pro
gram control to line 10 and the program repeats. To stop the Sound
Player program, press the RUN/STOP and RESTORE keys at the
same time.
Random Sounds
The following program generates random sounds using the RND
function. Each SOUND parameter is calculated randomly. Type the
program into your computer, SAVE it and RUN it. This program illus
trates how many thousands of sounds you can produce by specify
ing various combinations of the SOUND parameters. Here's the
listing:
^^PI^^"
FREQ DJ& HIN SV
WF
S^fN*iTRNDtl) *3) +1 :R'EM
)*65535) :fEM EREQ
1)*32767J iiEM DURATION
PW "
■ ■::$.:■■ :jfc ■:■>
^^■^ffi|ST'(:RiND(l)*65535;f:"' iREM'MIN FREQ
?:%4fp^^|j^{RNp( U * 3276 7f : 'ifEM fTEP. .VAL'. ., ■;■■...-.;<.:/
■■' ?.:'£:.
*:j F.jDIR;l?;,&| : PRINT • ■ ,:..■■■*.■. ■.■»»-,,
i i
u
Lines 10 and 20 PRINT parameter column headings and the under
line. Lines 30 through 100 calculate each SOUND parameter within
its specific range. For example, line 30 calculates the voice number
as follows:
30 V = INT(RND(1)*3) + 1
The notation RND (1) specifies the seed value of the random num
ber. The seed is the base number generated by the computer. The 1
tells the computer to generate a new seed each time the command
is encountered. Since the Commodore 128 has three voices, the
notation * 3 tells the computer to generate a random number within
the range 0 through 3. Notice, however, there is no voice 0, so the
136 USING C128 MODE—Sound and Music in C128 Mode