I too have a janome 6600p and did a lot of reading because I seemed to struggle with the FMQ part. I would say you have a lot of good advice already from other posters but if that does not resolve the issue have a look at the following interesting items :
http://www.quiltingboard.com/main-f1...a-t171947.html
http://content.janome.com/fusetalk/f...&threadid=1893
http://freemotionquiltingadventures....lt-set-up.html