Then select the whole area with other sound and use the "Apply noise filter" command.
(Main menu > Effects > Noise Reduction > Apply Noise Filter).
You can use "Modulate" command to add additional frequency into the sound. Select the area
you to use and apply "Modulate" command.
(Main Menu > Effects > Modulate).
If you want decreased the frequency use Band Pass command in "Effects" Menu.
(Main Menu > Effects > Band Pass/ Stop Filter).
