Is there command for frequency on an output for the arduino?

 

You mean PWM, don't you?

 

Yeah but lower waves not changing the default frequency, such as making a led flash at 36khz

 

Is there a library or simething that would do something like this:
frequencyOut(frequencyInHz, duration);

 

Hello/bump??

 

Is there a library that i can make (show code) that would simplify the process?