There are a couple of sites I have found for free mp3 backing tracks, they are both for guitarists but there is nothing to stop you putting them onto a SD Card with Jukebox and playing through the KN7000 as I have done. The first is mainly Pop/Rock but there are some good backings such as Eric Clapton etc. well worth a look http://www.guitarbackingtrack.com/ . The second is for any Shadows fans, a fan called Goran has created just about every Shads tune as a MP3 backing track http://goran.tangring.com/ .

Glen