I am not sure I would say it would be like the logarithmic. There is a big different between say 4A to 3A but going to 2 might not make much difference.
As FYI i have submitted a request to ACMA. I heard some one ring George and Paul and state that a brand new Sangean had issues with drop out with 2UE. I felt like asking her does it work on the ABC. My main point is they should standardise the error correction as they cannot control the firmware of all the devices out there. Maybe I should move this post back to digital radio :).