Pls I need your help..am using zoom H4n pro with shotgun rode NTG2 doing out door shot shooting a short movie but in my post editing there a little noise of issss or abians noise..doe all noise on my outdoor shooting is reduce..but i need clean clean voice no background isss or abians..how can I achieve that..my zoom volume is on 55 on the left handside and side right hand volume is 65..need help..