Hola:
...SOUND Pin, [ Note,Duration {,Note,Duration...} ]
Overview
Generates tone and/or white noise on the specified Pin. Pin is automatically made an output.
Operators
Pin is a Port.Pin constant that specifies the output pin on the PICmicro.
Note can be an 8-bit variable or constant. 0 is silence. Notes 1-127 are tones. Notes 128-255 are
white noise. Tones and white noises are in ascending order (i.e. 1 and 128 are the lowest
frequencies, 127 and 255 are the highest). Note 1 is approx 78.74Hz and Note 127 is approx
10,000Hz.
Duration can be an 8-bit variable or constant that determines how long the Note is played in
approx 10ms increments.
As you see instruction SOUND dont work with yours needs..
Perhaps you can use PORTB.3 high,,pause 10,,PORTB.3 LOW something like this must work or think that you can use a PLL controled by a PIC In this case you can control the PLL division with a PIC and you see the subtone in a LCD display.
I have the complete manual of both soft PLUS and PRO ,if you need only send me where I can Upload.They are about 2.5 mg in pdf format.This also can help you for find the best way for solve your question.
Best Regards
THIS ISNT FOR YOU ITS THE TRANSLATION because this pages are in spanish....
POR RESPETO AL FORO incluyo mi contestacion al colega en castellano
Contesto que a los efectos de sus necesidades la instruccion SOUND no sirve por la gran cantidad de armonicas que genera pues parte de ruido blanco y pues comienza en 78 hz y el necesita partir de 74cs.le sugiero utilizar intruccines de portBhigh pausas y port b.3 low o un pll cuyo control lo efectue si con un pic y lcd para la presentacion del subtono que esta utilizando y le ofrezco el manual que puede ayudarlo a encontrar la nejor salida para su requerimiento....
saludos
khasistos