obviously I haven't seen your sequence but if by recording solely in composer you mean the melody was recorded in the composer? -then either any repeats occur before 16 bars or you used A, B and C and switched between them for the complete melody? adding custom also in this way would expand the possibilities for a total of 368 independent bars.

This type of principle would be the same as pads bank 5 and 6 where chord sequence and melody are preprogrammed and played from any starting key, and also the solo composer variation of the old Americana software series, and is a very good way of giving either hand (or both!) a rest