cubase LE.....sony sound forge or cool edit pro????i try 2 use it but it cuts parts of my audio off n idk how 2 mess wit it

RTFM

and speak english.

Do you know how to use noise gates?

Try lowering the threshold - make the attack and decay times a bit longer -

You also have an auto gate trigger at the top of the window - this selects the frequency band that triggers the gate - you can adjust this.

PS, as Rhone Ranger said - Read the f(?) manual - (Help menu - documentation - operating manual)