Just thought I would pass on some good news reference my SD card audio problem. I have created a new topic so it stands out and may be of help to others.
Even using a 1 GB (Sandisk) SD-Card I could not put more than 3 CD's worth of audio files onto a card without the KN7000 displaying an 'Error 83' message. I have just upgraded the firmware from 1.3 to 1.6 and its fixed the problem, I have just copied 8 backing tracks CD's to the SD Card and it plays fine without any nasty error messages. Also a friend gave me a copy of SD Jukebox version 5 he no longer uses and that works fine on the KN7000 and it no longer has a limit on the number of checkouts per song unlike version 2.4
Hope the above is useful
Glen