The sub offset did not work prior to this update. It does now, provided you do not create a situation where the sub trim is being reduced by more than 15dB through a combination of sub level trim in your surround configuration adjustments and the 2-channel sub offset.
The actual tone level when you create an attenuation of -16dB is NOT accurate, keep it above -16dB (-15db on up) and it is.
Otto, give us a call at 866-OUTLAWS and will get you straightened out.