Commodore Plus 4 - Sound command

-
THE ^ne SOUND command tells your Plus/4 everything it needs to know
SOUND abou! tne souncl y°u want t0 Plav The SOUND command is followed
COMMAND
by three numbers that describe the note.
SOUND voice, note value, duration
The first number in the sound command refers to voice. The number for
voice can be a 1,2 or 3. The Plus/4 sound is produced by two different
"voices", 1 for the first voice and 2 for the second voice. The third voice
option applies to voice 2's ability to produce either a tone or noise.
Voice 1 —This voice plays only tones. Select this voice with a 1 after the
SOUND command.
Voice £ —This voice is like voice 1. but can be used to play tones or
noise for sounds. Type a 2 in the command to use this voice for tones,
or a 3 to use this voice for noise, to make sound effects like thunder
and rain.
The second number after the word SOUND is the note value (fre
quency). This can be any number from 0 to 1023. It tells your Plus/4
how low- or high-pitched a note to play As the numbers get larger, the
notes get higher. The highest values (in the 1023 neighborhood) are
not audible to the human ear
Note: Noise is "white" only in the range of 600-940 with Voice 3.
You can use register values outside this range to create interest
ing sound effects.
Here is a chart that shows all of the notes in one scale, along with the
note value to use. There is a complete chart of notes for the Plus/4 in
SOUND
NOTE
FREQUENCY
-ML
0
M9 ■
--—
4P
---
■39 •' "98
r
19; ■■ 494
:.; :
J
#
—-"
-
" —
85- B&
59
B5B
9'
Rfll
-•
BBO 7
106