If I've understood you correctly, the Tyros has 4 zones that can be looped.
Eg. Marker1--Marker2--Marker3--Marker4--End of sequence
(-- being a zone)

Once you're in that zone, you press the loop button and it will keep going back to the previous marker until you press loop again, which will then make it carry on into the next zone.

[This message has been edited by Yammy (edited 07-03-2003).]