I have put more jam tracks up if people are interested.
They are all free - literally - no advertising on the site etc - it's just for the common good of people who like jam tracks.
They are currently set up for guitarists/lead instruments here:
http://www.freejamtracks.com
and a few for bass players are on here:
http://www.freejamtracks.com/tracks4bass.html
They are mostly blues and country type progressions at the moment.
Have fun.
Cheers,
Nick.