bascom hilfe:
Syntax
SOUND pin, duration, pulses


Remarks

Pin: Any I/O pin such as PORTB.0 etc.

Duration: The number of pulses to send. Byte, integer/word or constant.

Pulses: The time the pin is pulled low and high.
This is the value for a loop counter.
When you connect a speaker or a buzzer to a port pin (see hardware) , you can use the SOUND statement to generate some tones.

The port pin is switched high and low for pulses times.
This loop is executed duration times.

The SOUND statement is not intended to generate accurate frequencies. Use a TIMER to do that.


so wie es aussieht ist die generierte frequenz auch stark von der taktrate des up abhängig... und um genaue frequenzen zu erzeugen nicht geeignet...

gruss bluesmash