After doing a google search I came across an article dating from Sept 2009 saying that the EU volume limit for mp3 players is 80dB, is this the current regulation and the limit which the new firmware imposes?
The Quick Start Guide says the following “Studies, including one from the NIDCD indicate that sounds of less than 80 decibels, even after long exposure, are unlikely to cause a hearing loss”. So presumably I can then listen to everything on my mp3 at maximum volume and not worry about the effect on my hearing? Or is there any risk that certain songs with certain headphones can play louder than this 80dB?