In the update there are settings in the options screen to set the volume levels for the att functions.
Looking at the .skin file for the navi, the att button has code in it similar to above, when i think it should probably be using the code from the ExecTBL.ini file. Ill have to take a look at it and make sure its setup the way i wanted it to be.
The global command for att is "DUCK", the ON and OFF commands above i think dont do anything or aren't used by anything anymore (not sure right now)
But... the way it works is by a variable, so if you set it to ON and restart RR it will still be set to ON. In rr.ini there is a var called ATTENTION that has a value of 0/1 for the status of att on/off. When you click the button to turn it on, it saves your current winamp volume to a preset then changes the winamp volume to the value set from a var in rr.ini (attvol_low) and sets the attention var to on. The red text in the skin that says ON is based on the attention var. Its kind of complicated how it works, since there isnt a att feature in RR by default you have to code it yourself.
There has been some minor changes to this feature in the update, ill revisit the ATT button in the NAVI screen to make sure its doing what it should do.