E50 has the marker thing, and E60, too. Both have speakers, but are lightweight.

Markers are great! You put them in an SMF at different section boundaries, and on the fly you can Jump to any of them, removing the way SMF's always played back exactly the same...

You can't do this with MP3's, yet, though, in any arranger (short of software ones, AFAIK).

They help bridge the gap between arranger style mode, where you can go anywhere any time (but have to tie up your LH to do it), and SMF mode, which freed you up as a player, but was more preset in structure.

Now, you have the best of both worlds!

And, with synchronized style section, you can drop into style mode in the middle of an SMF, do what you feel like, then use Mark/Jump to cue up exactly where you want to drop back into the SMF again

The lines are beginning to blur away!