Commodore Plus 4 - Creating sound effects

A
MUSICAL
SOUND
EFFECT
Sound effects can be created using either musical tones or noise.
Combining simple BASIC programs and sound commands can gener
ate unusual and entertaining effects. For instance, the FOR... NEXT ..
STEP loop can be used creatively in sound effects. This program uses
a FOR... NEXT loop with a negative step, to count down from a high
number to a lower one.
10 VOL 8 -*
20 FOR S - 1000 TO 700 STEP -25
30 SOUND l.S. 1
40 NEXTS
sets VOLumeat 8
creates loop, with
downward STEPs
Type RUN and press RETURN to hear the sound effect. The key is
line 20. which selects a number range from 1000 to 700 going down
the scale. STEPping down 25 numbers at a time. Finally, line 30 in
structs your Plus/4 to play each note for just an instant by setting the
DURATION to 1. which is 1/60 of a second. Experimenting with dif
ferent number and duration values can give you some very interest
ing effects.
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