Commodore Plus 4 - DOS ERROR MESSAGES

Programming Sound and Music 175
SOUND voice, tone frequency, duration
1. Voice selects the voice in which the tone is to be played. There are two voices
and three voice settings (the second voice has an alternative setting):
Voice setting 1 plays 1024 tones.
Voice setting 2 plays the same 1024 sounds.
Voice setting 3 plays 1024 settings of noise.
You can play sounds from voices 1 and 2 simultaneously. Because voice setting
3 is an alternative setting for voice 2, you cannot simultaneously play sounds with
voice settings 2 and 3.
2. Tone frequency selects the frequency of the sound to be played. This setting
can be from 0 to 1023. Table 3-3 lists the numerical values for five octaves of
musical notes. Other values play tones but not musical notes. Noise can be played
in voice setting 3.
Note that, although the tones go from low to high, tone value 1023 is the lowest
note and 1022 is the highest. Tone value 0 is virtually as low as 1023. You
probably cannot hear a tone value between 1016 and 1022.
Table 3-3. Numerical Values for Five Octaves of Notes
Note
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
Octave 1
Frequency
7
64
118
169
217
262
305
345
383
419
453
485
Octave 2
Frequency
516
544
571
596*
620
643
664
685
704
722
739
755
Octave 3
Frequency
770
784
798
810
822
834
844
854
864
873
881
889
Octave 4
Frequency
897
904
911
917
923
929
934
939
944
948
953
957
Octave 5
Frequency
960
964
967
971
974
976
979
982
984
986
988
990
*596 is the setting for middle C.
Note: Use the following formula to calculate a frequency value for some other output frequency
(FO):
frequency = 1024 - INT( 111860.781 / FO)
The lowest possible frequency is about 109 Hz and the highest is above the audible range (over 20
KHz).