Welcome aboard , Sean! Yes, songs saved from the 5000 can be played in both the 6000/6500 series and the 7000. They cannot, however, be played in reverse order (that is from the 6000 or 7000 down to an earlier keyboard. Hope this helps.
Let us know if we cn help you in other ways; there are some great experts on this site.
[This message has been edited by Ted Rose (edited 02-17-2005).]