raas 767,
The A300 has a multi channel DFDR. However, the signals sent to the DFDR are not the actual "raw data" (real time) signals but are a repeat of the "averaged" signal as indicated on the pilot displays PFD's, ND's etc.
Hypothetically, if the rudder was slamming from stop to stop (NOT saying it was) the indication would be damped and shown to be far less severe on both the turn coordinator and the DFDR rudder channel(s) than it may ACTUALLY have been. Repeat, hypothetically.
I believe the FAA requested Airbus remove the DFDR averaging several years ago but Airbus never "got round to it", at least on this airplane.
Cheers,