Hi guys, so I noticed that my PMD 661 has an "Audio attenuator" feature on the pre settings. you can set it at either -6,-12 or -18. Problem is, I don't know what this does. I have messed around with it and can't seem to figure out what it is used for. Not to mention the hours I spent online trying to figure out what this device is used for. How could I benefit recording dialogue using this thing. My mic is an NTG2 if that helps at all.