Bono, Steve Jobs, etc.

[Keith]

On Jan 11, 2010, at 7:00 AM, Carvill, John wrote:

Therefore, it's not just a question of 'what were people listening to  
previously', because it's not the case that the number of 'portable  
audio device owners' has stayed constant while the format (cassette,  
MP3) changed. The new digital formats go hand in hand with the new  
digital devices. The new digital devices have brought about a big  
increase in the number of people using portable audio devices, and a  
lot of these people are using the MP3 format.

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So of the 'more people' using portable audio devices, what percentage  
of them are experiencing a decline in audio quality from what they  
were listening to previously?