'Mark track' is toggled by 'Cancel' button on Rio remote (just press, not hold, because it is used in situations where there is nothing to cancel). On Kenwood remotes it is 4, but it also works (by mistake?) on Rios. (I think I remember this discussed already). 'Mark' has nothing to do with bookmarks, except sharing a menu group. 7 cycles repeat (off, list, track) on both remotes.
Dragi "Bonzi" Raos
Zagreb, Croatia
Q#5196, MkII#80000376, 18GB green
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Dragi "Bonzi" Raos
Q#5196
MkII #080000376, 18GB green
MkIIa #040103247, 60GB blue