192 Input Calibration

[pktele]

Recently I recalibrated my 192 to -18dfs n input a and -12dfs on input b. Testing the inputs i am running a test tone directly into the inputs ( ie no pres etc) at a known value. Switching between
input a and input b in the hardware dialoge box produces NO change on the peak meter.As far as i understand i should be seeing a 6db change when i switch inputs. Am i misunderstanding something in the calibration process? ie - assuming changing these values is like increasing / decreasing the input sensitivity on a board? please enlighten me.

thanks
paul

[the dude]

both inputs are @ -18 from the factory
same for the outputs
FYI they dont go beyond -14