Advanced Receivers Research offers a sequencer board for $56. You can see it at http://www.advancedreceiver.com/page20.html . Yes, you can build one, but this is a turn key approach and with the board size of 2.5" x 3.5" it may fit inside the DEM transverter making for a tighter design. Anyone using one of these ? 73, Jon W0ZQ.